Rebuild your Mercury 803062T1 water pressure relief valve with the Buckshot Racing #77 kit — engineered for Mercury and Mariner V6 outboards, including XR6, V135, V150, and 2.0L to 2.5L two-stroke engines. Restore cooling efficiency and stop overheating at high RPMs. Rebuilding the water pressure relief valve using the Poppet Valve Rebuild Kit from Buckshot Racing #77, designed to replace the Mercury 803062T1, is a critical service procedure for maintaining peak performance in Mercury Marine and Mariner 135 HP to 200 HP V6 outboard engines. These engines—spanning the 2.0L, 2.4L, and 2.5L displacements—depend on a functioning poppet valve to regulate water pressure, especially under high RPM conditions. Failure to maintain this component can result in excessive engine temperatures, erratic cooling behavior, and ultimately, power loss or damage. The water pressure relief (poppet) valve assembly ensures that the engine's cooling system adapts dynamically, opening at mid-to-high throttle to release excess pressure while maintaining adequate cooling flow. Over time, the internal components—including the diaphragm, spring, and seals—can deteriorate due to continuous exposure to heat, vibration, and minerals or debris present in water. This wear often leads to symptoms like overheating at speed, fluctuating water pressure readings, or premature activation of temperature alarms. Buckshot Racing’s rebuild kit directly replaces the OEM Mercury 803062T1 parts, restoring the valve’s integrity and ensuring OEM-spec cooling system performance. It is compatible with a wide range of engines, including the Mercury XR4, XR6, Magnum II, Magnum III, V135, V150, V175, and V200—making it ideal for popular two-stroke outboards powering bass boats, offshore rigs, and family runabouts. The included parts—such as the poppet valve (part #10), diaphragm (part #5), spring (part #9), carrier (part #11), grommet (part #12), and related hardware—fit seamlessly into the factory valve housing. To rebuild the water pressure relief valve, begin by removing the valve cover (part #1) secured by bolts (part #2) and screws (part #8), noting that fastener torque values are crucial: 150 lb. in. (17.0 N·m) for bolts labeled “a” and 25 lb. in. (3.0 N·m) for screws labeled “b”. Carefully remove the gasket (part #3) and relief valve plate (part #4). Inspect the water deflector (part #6) and washer (part #7) for wear or corrosion, replacing if necessary. Next, disassemble the internal components—spring (part #9), poppet valve (part #10), and carrier (part #11)—and clean the housing thoroughly. Install the new components from the kit, ensuring correct placement of the diaphragm and spring to maintain pressure integrity. Use marine-safe grease where appropriate to ease installation and prevent sticking. Install the new grommet and reassemble the valve in reverse order, applying torque settings as specified. After reassembly, it is important to test the engine under operating conditions. Start the engine and monitor the water pressure gauge and engine temperature as RPM increases. A properly functioning valve will allow pressure to increase steadily before leveling off as the valve opens, maintaining engine cooling efficiency. Any signs of continued overheating or irregular pressure should prompt re-inspection of the assembly. Routine maintenance of the pressure relief valve, in conjunction with thermostat inspection and regular flushing of the cooling system, extends engine life and ensures consistent performance. Whether you're addressing overheating issues or conducting seasonal maintenance, the Buckshot Racing poppet valve rebuild kit for Mercury 803062T1 is a vital component for keeping your outboard engine running strong.

Mercury Diagnostics with the TechMate Pro Complete DDT Kit from Buckshot Racing #77 to Add Revenue, Boost Credibility, and Grow Your Business Start an Outboard Mechanics Business Service Offering! Are you a mobile marine mechanic or performance tuner looking to expand your services and increase income? Now’s the perfect time to add professional Mercury outboard ECU diagnostics to your offerings  with the TechMate Pro DDT Complete Adapter Kit from Buckshot Racing #77 . This next-generation tool gives you dealership-level diagnostics  for 1994–2025 Mercury outboards , including Optimax, Verado, SeaPro, ProXS, ROS, S3000, Racing (R-Series including 60R, 150R, 200R, 300R, 400R, 500R, APX 200, APX 250, APX 360) , and EFI/DFI 2-strokes. Whether you're servicing recreational, commercial, or high-performance boats, you’ll have the power to scan, clear codes, monitor live data, test sensors , and even reset ECU parameters  — all on-site. Adding this tool means you can now: ✅ Offer on-boat Mercury engine diagnostics  anywhere ✅ Serve clients with accurate ECU testing and fault resolution ✅ Build recurring service packages  (checkups, race prep, seasonal inspections) ✅ Create new revenue streams  through a premium, in-demand service If you’re already a mobile mechanic, performance tuner, or just starting a marine tech business, this is a low-cost, high-value opportunity  to differentiate yourself with a service that solves real problems quickly  for Mercury engine owners. 👉 With the TechMate Pro DDT, you’re not just reading fault codes — you’re providing trusted, full-spectrum diagnostics that can save your customers thousands. All you need is: The TechMate Pro handheld unit The Complete DDT-PRO Kit with 9 adaptors A 12V power source or ignition access at the dock Position your business at the forefront of marine diagnostics.  Add this service, promote it confidently, and start turning more calls into paying customers. Below is a proposed service offering you can use: ⚙️ Mobile ECU Diagnostic Service for Mercury Outboards and powered by the TechMate Pro Complete "DDT" Kit from Buckshot Racing #77 🔧 Overview: This on-site diagnostic service provides comprehensive ECU analysis using the official TechMate Pro Complete “DDT” Adapter Kit. Ideal for mobile marine mechanics, this offering delivers dealership-level diagnostic capabilities right at the customer’s dock, lift, or storage yard. ✅ Service Includes: ECU Communication & Health Check Fault Code Retrieval & Clearing Live Sensor Monitoring (RPM, temp, throttle, etc.) Freeze Frame Data Review Engine Runtime Logging by RPM Range Component Output Testing (injectors, coils, fuel pump) Power Balance & Cylinder Misfire Testing Throttle & Sensor Response Testing ECU Reset & Relearn (idle, fuel trims, etc.) 🧰 Supported Engines (1994–2025 Mercury Models): Optimax, EFI, DFI 2-Strokes Verado (L4, L6, V8, V10, V12) SeaPro, ProXS Racing Series: 200XS, 300X, 250R–450R, APX 4-Stroke EFI models from 40HP to 600HP 💵 Suggested Offerings: Package Price Includes Basic Checkup $99 Fault scan, comms test, and runtime report Full Diagnostic $179 Complete service with full test suite Performance Prep $199 Advanced sensor and runtime analysis for racing applications 📄 Final Reports: Delivered via PDF or printed copy, including: ECU status All fault codes & definitions Runtime history Observed sensor data Reset actions & recommendations 📞 Booking & Contact: This service offering is a solid business opportunity for mobile marine technicians equipped with the full TechMate Complete 9-Adaptor DDT-PRO Kit from Buckshot Racing #77. Note: Engine power-up and throttle-on conditions may be required for complete diagnostics. Download our free one-page sample service offering for your use: Check our complete kit to handle most any Mercury Marine and Mercury Racing Outboard model years 1994 to 2025:

Mercury 3.0L V6 Oil Injection Delete: Technical Overview and Procedure The oil injection delete procedure for Mercury and Mariner 3.0L V6 2-stroke outboards is a modification among performance enthusiasts and marine technicians. This process is relevant to 1994–2001 Mercury models, including the 225 HP, 250 HP, 300 Pro Max, and 300X variants with carbureted and EFI (Electronic Fuel Injection) systems. Importantly, DFI (Optimax) models are excluded, as their electronically controlled oil injection systems are integrated with the fuel injection and engine control module, making removal impossible without compromising engine functionality. The Buckshot Racing No. 77 Oil Injection Block-Off Kit is a purpose-built solution designed for these 3.0L V6 engines. The kit typically includes a block-off plug (commonly associated with part numbers 43453, 43453T, 43453-1, 433531, 785211, 825-505K), an O-ring (25-32509) for sealing, and mounting screws (10-41506). These part numbers align with Mercury’s OEM catalog, but due to subtle variations across production years, users are encouraged to confirm compatibility using a Mercury parts catalog or by consulting Buckshot Racing. The oil injection delete procedure involves removing the oil pump assembly, located at the base of the powerhead, along with its drive shaft, which is driven directly by the crankshaft. After removal, the block-off plug is installed in the oil pump cavity, accompanied by the O-ring and a marine-grade, non-hardening silicone sealant such as Permatex Clear RTV. This ensures a leak-free seal against vibration and thermal cycling in a marine environment. The block-off plug should be secured with the included screws, tightened to approximately 10–12 ft-lbs (typical for Mercury 3.0L oil system fasteners). Before installation, thoroughly cleaning the pump cavity is essential to ensure a proper seal and long-term reliability. In EFI models, bypassing the oil injection warning system is necessary to avoid false alarms or limp mode activation. These models typically include a rotation sensor integrated into the oil pump, which signals the ECU or warning module. Workarounds include leaving the sensor connected, using a resistor to simulate rotation, or referring to factory wiring diagrams to determine the correct resistance value. The oil tank sensor can be bypassed by leaving the tank half full or by jumping the sensor wires to simulate a “full” reading. However, caution is advised, as incorrect resistor values or wiring errors could trigger limp mode or engine warnings. For owners unfamiliar with ECU configurations, professional consultation is recommended. In contrast, carbureted models often lack the rotation sensor, making bypassing unnecessary and simplifying the delete procedure. However, the oil tank sensor may still need to be addressed to prevent false oil level alarms. Once the oil injection system is removed, switching to a pre-mix fuel system is mandatory. Mercury recommends a 40:1 or 50:1 fuel-to-oil ratio for these 3.0L V6 engines, with 50:1 offering a cleaner burn, 40:1 providing more lubrication for high-performance. We typically run 32:1 as all these motors are getting older and appreciate more lubrication. It is crucial to use a high-quality, TC-W3-rated 2-stroke oil and thoroughly mix it with the fuel—using a fuel mixer or by shaking the tank—to ensure even distribution and avoid lubrication issues. Redline and Klotz are two our our favorites. Pre-mixing not only ensures consistent lubrication but also eliminates risks associated with mechanical oil pump failures, such as gear wear or delivery inconsistencies under high loads. Basic tools such as a socket set, screwdriver, and torque wrench are needed to complete the procedure, and adding visual aids—like diagrams or videos from Buckshot Racing—can further assist with installation. In summary, the oil injection delete for Mercury 3.0L V6 outboards (1994–2001 carbureted and EFI models) is a proven modification for enhanced reliability and performance. By following proper procedures, using high-quality components, and exercising caution with sensor bypassing, owners can successfully convert their engines to pre-mix operation while maintaining optimal lubrication and engine longevity.

This is a printable Mercury V6 Outboard Single Trim Tilt Ram (Long) Assembly​ and exploded view parts diagram.

Mercury Outboard 2-Stroke V6 Power Trim Cylinder Repair Kit Installation Guide This detailed rebuild guide will walk you through the process of using the Buckshot Racing #77 Repair Kit for the Mercury Outboard 2-Stroke V6 Power Trim Cylinder, replacing the more expensive Mercury Mariner OEM part number 79879A1 kit. Ensure you work in a clean, lint-free environment to prevent contamination of hydraulic components. Tools Required: Spanner wrench Suitable container for draining oil Non-toxic solvent Compressed air Loctite “271” Torque wrench (58-72 ft. lbs.) Disassembly Instructions: Preparation: Disconnect the hydraulic hoses from the power trim cylinder as described in the Mercury Outboard service manual. Drain Hydraulic Oil: With the trim cylinder removed, direct the up and down ports into a suitable container. Push the trim rod in and out several times to drain the oil completely. Remove Trim Rod Assembly: Using a spanner wrench, unscrew the rod guide and pull the trim rod assembly out of the cylinder. Extract Floating Piston: Remove the floating piston by tapping the open end of the cylinder on a block of wood. Discard the old O-ring from the piston. Disassemble Shock Piston: Unscrew the bolt from the trim rod end. Remove the large washer and shock piston assembly. Extract the two O-rings, compression springs, spring guides, spring seats, and check balls. Discard the old O-rings. Remove Rod Guide Components: Take off the rod guide from the trim rod. Remove and discard the retaining ring, plain washer, scraper, and three O-rings from the rod guide. Clean All Components: Use a non-toxic solvent to clean all parts thoroughly. Dry each component with compressed air before reassembly. Reassembly Instructions: Prepare Rod Guide: Lubricate all internal parts with SAE 10W-30 or 10W-40 motor oil. Install three new O-rings (from the kit) onto the rod guide. Install the new scraper, plain washer, and retaining ring. Slide the rod guide over the end of the trim rod. Rebuild Shock Piston: Install the check balls, spring seats, compression springs, and spring guides into the shock piston. Install two new O-rings from the kit onto the shock piston. Assemble Trim Rod: Place the shock piston and large washer onto the end of the trim rod. Apply Loctite “271” to the piston rod bolt threads. Tighten the bolt into the piston rod to a torque specification of 58-72 ft. lbs. (8.02-9.95 mkg). Install Floating Piston: Fit the new O-ring from the kit onto the floating piston. Insert the piston into the cylinder with the blunt end first. Final Assembly: Insert the trim rod assembly into the trim cylinder. Thread on the rod guide and tighten securely. Post-Rebuild Steps: Reconnect the hydraulic hoses. Refill the hydraulic system with the manufacturer-recommended fluid. Bleed the system to remove air pockets. Test for smooth operation and check for leaks. Mercury Long Ram Rebuild Instructions - Free PDF Download

Mercury Racing’s cross-drilled reed plates represent a precision-engineered modification designed to enhance the performance of carbureted Mercury V6 2-stroke outboard engines. This upgrade has been widely used in legacy high-performance motors such as the SST-140  and SST-120 tunnel boat engines , as well as the 245 HP Carbureted 2.5 Liter  models. More recently, cross-drilled reed plates have been incorporated into configurations for engines used in US F1 tunnel boats , and high-output models such as the F150  and F200 . This article explores the technical design, performance advantages, and tuning considerations for these reed plates. Design and Functionality The cross-drilled reed plate, which sits between the carburetors and the reed valve assembly, features a series of precision-drilled passageways—typically around ½ inch (12.7 mm) in diameter . These holes are engineered to interconnect the internal cavities within the reed (intake manifold) plate , improving airflow dynamics. It’s crucial to clarify that these drilled passages do not bypass the reed valves . Instead, they serve to enhance the flow of the intake air into the reed cages, ensuring a smoother and more consistent delivery to the crankcase once the reed valves open. By introducing these cross-drilled channels, the modification reduces turbulence and localized pressure drops within the intake manifold. This optimized pathway promotes higher intake velocity and allows a greater volume of the air-fuel mixture to enter the cylinders more uniformly. The improved flow characteristics can lead to increased engine breathing capability, which translates into better throttle response, higher combustion efficiency, and ultimately, enhanced horsepower output. Performance Advantages In well-tuned setups, cross-drilled reed plates have been shown to contribute an increase of approximately 10–15 horsepower . This gain is a result of enhanced volumetric efficiency and superior cylinder filling dynamics, which improve the density and distribution of the fuel-air mixture entering the combustion chambers. Engines such as those found in US F1 tunnel boats , along with the F150  and F200  models, have benefited from these modifications, particularly in racing applications where maximum power output is a critical factor. The design also contributes to smoother throttle transitions and quicker engine response, characteristics highly valued in competitive racing scenarios. The cross-drilled reed plate optimizes the airflow through the intake manifold, helping to ensure a more homogenous fuel-air mixture across all cylinders, which can reduce detonation risk and improve overall combustion stability. Tuning Challenges and Considerations While the performance gains from cross-drilled reed plates are significant, they introduce certain tuning complexities. The alteration in airflow dynamics can lead to subtle imbalances in air distribution across the reed cages, potentially causing variations in fuel delivery to individual cylinders. This uneven mixture distribution can result in inconsistent combustion behavior, which may negatively affect overall engine reliability in the mid-range (4-6 rpms) and performance. Carburetor tuning becomes more critical with the installation of cross-drilled reed plates. Adjustments to the jetting and fuel metering systems are often required to maintain optimal air-fuel ratios under varying load and throttle conditions. Precise tuning is essential to fully realize the benefits of the enhanced airflow while minimizing the risks associated with uneven fueling. Furthermore, while this modification is highly effective for wide-opened racing and high-performance applications, such as US F1 tunnel boats  and Mercury Racing F150 and F200  models, it may not be suitable for recreational marine engines. The increased tuning complexity and the potential for uneven fuel distribution could outweigh the performance advantages for non-competitive uses. Advanced Tuning Strategies for Cross-Drilled Reed Plates To maximize the performance benefits of cross-drilled reed plates in Mercury V6 2-stroke engines, including US F1, F150, and F200 models, precise tuning of the entire induction and ignition system is critical. The increased airflow provided by the cross-drilled reed plate can lean out the air-fuel mixture, necessitating careful carburetor tuning. This often involves increasing main jets 10 sizes to enrich the mixture, while adjusting low-speed and idle jets ensures stable operation at lower RPMs. Monitoring the air-fuel ratio is another key factor. Installing an exhaust gas temperature (EGT) gauge enables real-time tracking of mixture balance across all cylinder banks, helping to prevent lean spots that could lead to detonation or piston damage. Upgrading to a higher-performance reed and reed cage may be advisable. Dual-stage reeds with optimized tension are commonly preferred for race setups such as US F1, as they help manage the increased airflow velocity and maintain consistent reed behavior at high RPMs. With higher airflow and potentially increased combustion pressures, ignition timing may also require adjustment. Advancing the timing slightly can help optimize combustion efficiency, but it is important to proceed cautiously. Complementing these adjustments, attention to crankcase and cylinder port matching is crucial, particularly in engines with extensive modifications when allowed by your rule set. Ensuring that the crankcase and porting align with the increased airflow capacity of the cross-drilled reed plate prevents bottlenecks and optimizes overall performance. Conclusion Mercury Racing’s cross-drilled reed plates offer a significant performance enhancement for carbureted Mercury V6 2-stroke outboard engines, including high-performance configurations like the SST-140 , SST-120 , US F1 tunnel boats , and models such as the F150  and F200 . By increasing airflow velocity and improving the uniformity of the intake charge through the reed (intake manifold) plate, these reed plates can deliver substantial horsepower gains and better engine responsiveness. However, successful implementation requires meticulous carburetor tuning and an understanding of the potential trade-offs involved in airflow distribution and fuel delivery. For competitive racing environments, the cross-drilled reed plate remains a highly effective modification to extract maximum performance from Mercury’s V6 2-stroke outboards.

How Gear Ratio Changes Affect Propeller Pitch: A Boater’s Guide When tuning a boat for optimal performance, one of the most overlooked yet crucial aspects is how a change in gear ratio affects propeller pitch. If you’re changing your lower unit or modifying your gear ratio, you’ll likely need to adjust your propeller pitch to maintain the correct RPM range and overall efficiency. Understanding Gear Ratios and Propeller Pitch The gear ratio in an outboard or sterndrive engine represents the number of engine rotations required to turn the propeller once. For instance, a 1.75:1 gear ratio means the engine must turn 1.75 times for every propeller rotation. A higher gear ratio (numerically) reduces propeller RPM at a given engine speed, which increases torque but reduces speed. This shift requires a higher pitch propeller to maintain the same speed and RPM balance. Conversely, a lower gear ratio (numerically) means the propeller spins faster at the same engine RPM, and you must reduce pitch to avoid over-revving. Gear Ratio Change: 1.60 to 1.75 Switching from a 1.60 to a 1.75 gear ratio increases the numerical ratio, which slows down the propeller at the same engine RPM. This change results in an approximate RPM increase of 586. To maintain the same water speed and engine efficiency, you’ll need to increase your propeller pitch by about 2.81 inches. In real-world terms, that equates to increasing the pitch by 2 to 3 sizes, such as moving from a 30-pitch to a 32 or 33-pitch propeller. Gear Ratio Change: 1.75 to 1.87 If you go from a 1.75 to a 1.87 gear ratio, the engine will need to turn more times for each propeller revolution, which again lowers prop shaft speed. This causes an approximate increase of 470 RPM. The pitch needs to be increased by 2.06 inches, or roughly 2 sizes, to compensate for the change. A typical adjustment would be switching from a 30-pitch prop to a 32-pitch to maintain consistent RPMs and speed. Gear Ratio Change: 1.87 to 2.10 A jump from 1.87 to 2.10 is more significant and results in the largest RPM change on the chart—an increase of 899 RPM. To maintain optimal performance, a pitch increase of 3.86 inches is necessary, which translates to 2 to 4 pitch sizes. This could mean increasing from a 30-pitch to somewhere between a 33 and 34-pitch propeller, depending on how your engine responds under load. Why Proper Matching Matters Matching your gear ratio to propeller pitch is essential for maintaining proper engine health, performance, and fuel efficiency. If your pitch is too low after a gear ratio change, you’ll over-rev the engine, leading to potential damage and excessive fuel burn. If the pitch is too high, the engine may "lug" or struggle, reducing performance and acceleration. Accurate adjustments based on tested data—such as the Buckshot Racing chart—help ensure you stay within your engine’s optimal RPM range. Final Thoughts Before making gear ratio changes or swapping lower units, it’s vital to consider the effect on your propeller pitch. Charts like this serve as a powerful tool for boaters, helping to avoid trial-and-error setups that can cost time, money, and engine life. When possible, validate your setup with on-water testing and use a tachometer to ensure your engine is operating within the recommended RPM range. 1.87 Ratcheting Gear Set for Mercury 200 Case https://www.wix.app/stores/1987fe67-d19d-4b23-9740-f64334fd4390/catalog/f3d6c43a-a67a-994d-df93-66a0dd6927c2?d=https://www.buckshotracing77.com/product-page/1-87-ratcheting-gear-set-for-mercury-200-case Buckshot Cleaver https://www.wix.app/stores/1987fe67-d19d-4b23-9740-f64334fd4390/catalog/b5fe139c-6f78-5388-b989-7b888f49426f?d=https://www.buckshotracing77.com/product-page/buckshot-cleaver Flo-Torq II Hub Kit https://www.wix.app/stores/1987fe67-d19d-4b23-9740-f64334fd4390/catalog/f4ec3d01-227d-36ff-f8a3-f203382688e2?d=https://www.buckshotracing77.com/product-page/flo-torq-ii-hub-kit Flo Torq Replacement Hub https://www.wix.app/stores/1987fe67-d19d-4b23-9740-f64334fd4390/catalog/5d500047-2406-cbc4-7c79-a5964b57f3af?d=https://www.buckshotracing77.com/product-page/delrin-replacement-drive-sleeve Mercury Nylock Prop Nut + Washers Kit https://www.wix.app/stores/1987fe67-d19d-4b23-9740-f64334fd4390/catalog/7c2ccbf5-5741-6566-8ed6-6dcf24286b21?d=https://www.buckshotracing77.com/product-page/mercury-nylock-prop-nut-washers-kit

8 Design Features of High-Performance Boat Props A high-performance boat propeller works by converting engine torque into thrust. Through the careful manipulation of water flow, the propeller blades are engineered to displace water efficiently—producing lift and forward motion in a manner that matches the hull characteristics and application of the boat. When a propeller spins, it accelerates water rearward. This creates a low-pressure zone at the front of the propeller, drawing water in, while high-pressure water is ejected behind it. This pressure differential generates thrust—the core force moving the boat forward. But thrust alone isn’t the full story. A properly designed propeller must also balance lift, especially when hull designs vary. For example, naturally lifting hulls like Tunnel or Mod VP styles require less lift from the propeller. This allows more of the engine's energy to be dedicated to forward motion. In contrast, heavy v-bottom boats may need a prop that contributes more to vertical lift, helping get the boat onto plane efficiently. Designing a winning stainless steel propeller blends both art and science. However, eight key design elements define the engineering behind any performance propeller. Understanding these principles is essential for selecting, tuning, or developing the right prop for your needs: 1. Rotation Most props are right-hand (RH) rotating. However, left-hand (LH) rotation is common in twin-engine setups and F1 tunnel hulls. Using counter-rotating props improves handling and balance, especially under high-speed or racing conditions. 2. Pitch Pitch is the theoretical distance the propeller would move forward in one full rotation—like a screw in wood—assuming no slippage. Higher pitch typically equals more speed, but too much pitch can bog down acceleration or increase strain on the engine. 3. Diameter The diameter is the distance across the circle the blades make during rotation. It impacts both the volume of water moved and the tip speed. Larger diameters can increase thrust and lifting force, especially when the prop is run higher on the transom. 4. Rake Rake refers to the angle of the blades relative to the hub. More rake helps hold the bow of the boat higher, which is useful for high-speed performance. However, excessive rake can reduce forward efficiency and overload the engine. 5. Progression This describes the change in pitch from the leading edge of the blade to the trailing edge. A progressive pitch design improves acceleration (hole-shot) while still delivering top-end speed. However, too much progression may reduce high-speed efficiency. 6. Blade Area Blade area is determined by both the number and size of the blades. More area increases the ability to carry load, which is essential in heavy boats or high-drag situations. However, more surface area can also create more drag at high speeds. 7. Cavitation Cavitation occurs when water vaporizes due to low pressure at the blade surface. A small amount of cavitation can aid performance—like a torque converter—but excessive cavitation reduces thrust and can damage the propeller over time. 8. Cupping Cupping adds a small lip to the trailing edge of the blade. This increases effective pitch, helps lift the bow, and can reduce RPMs. It's particularly effective in improving bite in turns and preventing cavitation. Conclusion Understanding these eight core elements allows boaters, racers, and builders to tailor their propeller to match their boat, setup, and goals. Whether you’re chasing hole-shot, top-end speed, or improved handling, tweaking these design features can transform your performance on the water. Eagle ET Propeller https://www.wix.app/stores/1987fe67-d19d-4b23-9740-f64334fd4390/catalog/6d19806c-01eb-1280-1478-1570a54c30d4?d=https://www.buckshotracing77.com/product-page/eagle-et-propeller

For 220W, 400W, and 600W EPS Models – Designed for US F1, F1H2O & Race Boats with Cable and Pulley Steering Systems Installing an Electronic Power Steering (EPS)  system can transform the handling of your high-performance race boat by delivering responsive, effortless steering control under high G-loads, rough water, and aggressive cornering. Whether you're racing in US F1, F1H2O, or any high-speed competition class using a traditional cable and pulley steering system, this guide will walk you through the professional installation of your EPS kit and help you choose the right model for your setup. Choosing the Right EPS System for Your Boat The EPS system comes in three powerful configurations to match the specific demands of various racing engine classes. Each model is designed to enhance boat control, reduce driver fatigue, and improve overall performance under race conditions. The 220-Watt (220W) EPS system  is best suited for lightweight, lower-horsepower race boats equipped with engines up to 125 HP. This includes popular models such as the OMC SST-45, SST-60, and Yamaha 3-cylinder outboards. This system delivers reliable electronic assist during sharp turns, rough water runs, and "on-the-pad" balance where fine adjustments are critical. If you’re running a smaller, nimble hull in competitive classes, the 220W is a perfect match. The 400-Watt (400W) EPS system  offers increased power for mid-range high-revving racing engines. This version is ideal for boats powered by Mercury Racing 2.5L, S3000, SST-120, F1, F2, Optimax SST-200XS, 300 Drag, or OMC V6 2-Stroke engines. It strikes the perfect balance between assist force and steering feedback, making it ideal for competitive drivers who require tight cornering, fast recovery from chine walk, and superior tracking through rough conditions. The 600-Watt (600W) EPS system  delivers maximum torque and steering assistance. Designed to manage the steering loads from Mercury APX 200 HP, 250 HP, and 360 HP 4-Stroke engines, or even classic OMC V8 2-Strokes, the 600W model ensures stable, responsive steering at any speed. This system is ideal for circle boat setups or heavy-duty race applications where power steering is a critical safety and performance factor. What’s in the EPS Kit? Each EPS system comes complete with the following components engineered for durability and precision: A motor-specific mount  for securing the electric assist motor Two adjustable steering shafts A set of M10 x 20mm flat head cap screws  (Qty: 4) for motor mounting A pair of M8 x 20mm hex head cap screws  (Qty: 2) for the ECU The Electronic Control Unit (ECU)  that manages input signals A high-torque EPS motor A wiring harness  and a wiring connectors kit  to link the entire system These kits are engineered to integrate with your boat’s existing steering layout, with only minor adjustments necessary to accommodate the mount and shafts. Preparation for Installation Before beginning installation, it’s essential to download and review the full instruction manual that includes wiring diagrams and installation illustrations. Check all electrical connectors to ensure that rubber gaskets are fully seated to prevent moisture intrusion. If needed, gently press them in using a flathead screwdriver. Make sure your existing steering cable and pulley system is in good condition, as the EPS is designed to supplement, not replace, mechanical components. ECU Mounting Choose a secure and protected area within the cockpit or hull compartment to mount the Electronic Control Unit (ECU) . This location should offer easy access for future diagnostics while remaining isolated from water spray or vibration-prone surfaces. Using the provided M8 hardware , fasten the ECU securely. Ensure the unit is oriented properly to avoid wire stress and interference. Motor and Mount Installation Next, prepare the motor mounting system. The EPS motor  must be mounted firmly to absorb torque without flexing. The provided mount  may need minor modifications to fit your hull or steering tray configuration. Once aligned, secure the motor to the mount using the M10 screws . Tighten the hardware evenly to prevent binding or misalignment. Steering Shaft Installation The EPS kit includes two steering shafts , which serve as the mechanical link between the motor and your cable system. Adjust the shaft lengths and angles to ensure smooth operation, avoiding tight bends or misalignment with the existing pulleys. Once fitted correctly, secure the shafts to the motor using the supplied hardware. Check for free movement throughout the entire steering range before proceeding. Wiring the EPS System With the mechanical components in place, it’s time to wire the system. Connect the EPS motor to the ECU using the supplied wiring harness . Each wire is color-coded for easy reference: Red wire  connects to the battery positive (+) Black wire  connects to the battery negative (-) White wire  activates the LED diagnostic light A separate line connects to a switched 12V ignition source Route and secure all wiring using zip ties and protective loom. Avoid routing wires near hot engine parts or sharp edges. Coil and secure any unused wires, such as a blue wire on some models, in a dry location. System Activation and Diagnostic Test With everything connected, turn the ignition key to activate the system. The EPS unit should power on, and the diagnostic LED  will flash once for about one second before turning off. This indicates proper system operation. If you observe different flashing patterns or no light at all, refer to the diagnostic codes provided in your kit manual. Final Checks and Compliance Before hitting the water, double-check all hardware connections and wire routing. Make sure nothing is loose or exposed. Retain the original packaging until installation is fully confirmed. This EPS system is engineered for performance marine use and should be installed by experienced technicians. Always ensure your setup complies with local, state, and federal boating regulations. Any modification to this EPS kit outside of recommended configurations may void your warranty and could compromise safety or legality. If you need additional support or want to view the full illustrated manual, download below or contact Mike@BuckshotRacing77.com or +1-714-697-1716. This guide will help ensure your Electronic Power Steering system is correctly installed for peak performance, safety, and control  in any racing environment. Download the PDF install guide below!

A Century of Speed and Innovation: Honoring Paul O’Neil Allison and the Legacy of Allison Craft Boats . The marine racing world mourns the passing of a true American original. Paul O’Neil Allison, visionary inventor, artist, and co-founder of Allison Craft Boats, passed away peacefully on May 7, 2025, at the age of 100. For more than six decades, Paul was a leader in boatbuilding, a pioneer of racing innovation, and a beloved figure in both his industry and community. His legacy lives on in every hull design, propeller tweak, and racing team still chasing the speeds he helped make possible. The Allison Legacy: A Family Tradition Rooted in Craftsmanship The Allison family’s journey in boatbuilding began long before fiberglass, outboards, or competitive drag racing. In 1917, Paul’s father, Rev. James Allison, built the very first Allison boat. That spirit of craftsmanship passed to Paul, whose own story began in earnest in 1955 when he was given a rotten wooden boat. He salvaged the hardware and used it to construct his first racing hull—a sleek, handcrafted vessel that outperformed anything he had previously raced. Encouraged by early success and recovering from a life-altering hunting injury, Paul decided to leave his auto body business behind and pursue boatbuilding full-time. That same year, he and his wife Lucille, his partner in life and work for 76 years, founded Allison Craft Boats in Friendsville, Tennessee. Record-Breaking Speeds and the Rise of Allison Craft Boats By 1959, Paul had built his last wooden boat—but not before making history. That year, he became the first to break 60 miles per hour in a production outboard pleasure boat, setting a straightaway speed record of 61.8 mph with just an 80-horsepower motor. This breakthrough would define the Allison legacy: fast, efficient, and engineered for excellence. In 1960, with fiberglass technology emerging in marine construction, Paul designed and built his first 14-foot fiberglass boat. This lighter, faster, and more aerodynamic craft became the foundation for decades of high-performance innovation. The Allison team’s appetite for speed only grew. Throughout the 1960s and 1970s, Paul’s boats continued to set new benchmarks: 1962 – Surpassed 70 mph 1964 – Surpassed 80 mph 1968 – Surpassed 90 mph 1969 – Surpassed 100 mph (twin engines) 1975 – Surpassed 110 mph 1984 – Surpassed 120 mph 1987 – Reached 129+ mph These were not experimental race machines—they were real boats, using production components, pushing boundaries year after year. Engineering Innovations That Redefined the Water Paul Allison wasn’t just building boats—he was shaping the very future of performance boating. From the 1950s through the 1980s, he pioneered a number of now-standard marine technologies that forever changed how high-performance boats were built and handled. In the 1950s, he introduced the cupped propeller, a revolutionary change that improved bite and control at high speeds, eventually catching the attention of Carl Kiekhaefer at Mercury Marine. Around the same time, Paul also developed the first hydraulic power trim, allowing for dynamic control of boat attitude under throttle. The 1960s saw Paul’s development of the first V-bottom hull with a pad, which dramatically improved lift and tracking—particularly at high speed and during acceleration. This design remains foundational in bass boat hull architecture to this day. During the 1970s, Paul took marine aerodynamics even further. He introduced wing stabilizers, front foils for tunnel boats, and the cupped skeg—each contributing to better lift, reduced drag, and precise tracking under extreme performance conditions. Paul’s relentless experimentation became legendary. On many early mornings, he could be found at a Tennessee boat ramp, applying Bondo to the bottom of a test hull, making temporary shape changes, running test passes, then chipping or sanding the material off to evaluate the results. These hands-on techniques were years ahead of their time and didn’t go unnoticed. One of those who observed Paul firsthand was Rourk Summerford, who would go on to found both Laser Boats and STV Boats (Summerford Tunnel Vee) after working. As a young man, Summerford watched Paul at those ramps with admiration, witnessing his process of refining bottom designs in real-time. The experience left a lasting impression. In tribute to Paul’s impact on his life and career, Rourk named one of his daughters Allison—a heartfelt nod to the man who helped shape his future in racing and performance boat design. OPC and APBA: The Golden Age of Racing The 1960s and 1970s marked the golden age of OPC racing—Outboard Pleasure Craft, which later evolved into Outboard Performance Craft—and Paul’s boats were at the heart of the action. Under the sanction of the American Power Boat Association (APBA), Allison Craft boats became a dominant force. What made OPC racing special was its accessibility. Enthusiasts could walk into a dealership, buy a production Allison Craft boat, pair it with a stock Mercury, Johnson, or Evinrude outboard, and head straight to the racecourse. Competitors raced in popular classes such as E Class, G Class, Family Sport (FS), and Family J (FJ)—and Allison boats were consistently at the front of the pack. This era showcased not just the speed of Paul’s designs, but also their reliability, handling, and pure racing DNA. Drag Boat Racing: The Next Frontier In the early 1980s, Mod VP and drag boat racing rose in popularity, demanding a different type of performance—one that emphasized acceleration over handling. Allison Craft Boats met the moment, once again becoming the vessel of choice for serious racers. Their lightweight construction, aerodynamic efficiency, and hallmark pad-bottom hulls helped racers consistently hit triple-digit speeds down the quarter mile. From casual showdowns to sanctioned national events, Allison drag boats are still to this day feared, revered, and nearly unbeatable in the hands of skilled pilots. A Life Beyond the Water: Family, Farming, and Friends Paul’s contributions weren’t confined to propellers and hulls. He and Lucille also operated Allison’s Catfish Restaurant, a beloved local landmark that reflected the same family values and attention to quality that made their boats famous. He was also a gifted artist, known for his attention to detail and love of creative expression. At home on his farm, Paul’s favorite pastime was building waterfalls and digging in the dirt with his Bobcat—a joy he carried into his later years with childlike enthusiasm. Paul was preceded in death by Lucille and his parents, Rev. James and Ressie Allison. He is survived by his children—Darris (Nancy), Denise (Mike), Danette (Steve), and Donna (Donnie)—as well as a large and loving family of grandchildren, great-grandchildren, nieces, nephews, and countless friends from both the racing and restaurant communities. Honoring a Legend: Tributes Across the Racing World Paul’s influence continues to be felt in race pits and boat garages across the country. Racers and fans like Buckshot Racing #77, and countless others, are paying tribute to the man whose designs helped them reach new levels of speed, safety, and competitive excellence. Whether racing bass boats, OPC, Mod VP tunnel hulls, or drag boats, competitors knew one thing: if it was built by Allison, it was built to win.

Managing Overvoltage in Mercury High-Performance 2-Stroke V6 Outboards with Billet Flywheels Mercury’s high-performance 2-stroke V6 outboards—particularly the 2.0L, 2.4L, and 2.5L models including the XR2, XR4, XR6, 150, 175, 200, 225 Pro Max horsepower variants, along with race motors like the 260 EFI Offshore, 300 Drag, S3000, and SST120—are built for high-RPM operation, often spinning well beyond 7,200 RPM. Many of these engines rely on a 16-amp charging system to minimize rotational mass and reduce parasitic drag, critical for maximum throttle response and performance. However, when these motors are modified with aftermarket billet flywheels containing rare-earth magnets, significant and potentially damaging overvoltage issues can occur—particularly if the charging system remains unregulated. From the factory, Mercury’s 16-amp stator and flywheel systems used ferrite-based magnets , often referred to generically as ceramic magnets. These magnets were embedded in either a cast steel flywheel or, in the case of factory racing flywheels, a lightweight aluminum version. While ferrite magnets are relatively corrosion-resistant and cost-effective, they are also brittle , prone to chipping or cracking, especially under the extreme vibrations and thermal cycling typical of high-performance outboard use. Their magnetic output is stable but relatively modest, matching the voltage handling characteristics of the early rectifiers and ignition modules used in these systems. Modern billet aluminum flywheels used in performance upgrades often replace the original ferrite magnets with rare-earth magnets , such as neodymium. These magnets can produce up to three times the magnetic field strength  of the originals. That increased field density translates directly into higher stator output voltage —a benefit in theory, but one that quickly becomes a liability when used with the unregulated three-post rectifiers  that Mercury originally supplied with many of these engines. In a standard 16-amp system, the stator output at idle might be around 30 volts AC. But at high RPM—especially in the 7,200+ range common with the 260 EFI, Drag, and S3000 platforms—AC voltage can climb beyond 90 volts. When rectified but left unregulated, this can produce DC charging voltages as high as 15.5 to 17 volts , depending on the battery’s load and condition. Such levels far exceed what most 12V batteries or electronic systems can tolerate. Overvoltage at this scale has a direct and measurable impact on engine reliability . Batteries begin to gas and boil, especially if they are sealed AGM types, and over time, cells will dry out and fail. Lithium batteries without a proper Battery Management System (BMS) can enter protection mode or shut down altogether. Deep cycle batteries, though often marketed as "marine-grade," are generally not well-suited for the fast-charge, high-RPM environment of a 2-stroke outboard stator system. A large, flooded lead-acid starting battery remains the most tolerant  of brief overvoltage conditions due to its internal structure and buffering capacity. But it’s not just the battery at risk. Mercury’s ADI and CDI ignition systems —especially the switchboxes and stator windings—are highly sensitive to excessive voltage. Consistent exposure to anything above 15 volts DC  can cause switchbox overheating, misfires, and eventually catastrophic failure. If voltages in the 16–17V range are observed during operation, the engine should be shut down immediately  to prevent ignition or charging system damage. To resolve this, a combined 20-amp regulator/rectifier  is the proven solution. This modern unit performs both rectification and voltage regulation, clamping output safely at approximately 14.4 volts , regardless of engine speed or stator voltage input. This makes it ideal for use with rare-earth magnet billet flywheels and high-RPM applications. It ensures consistent, safe battery charging and stable voltage delivery to all engine electronics. The 20-amp regulator/rectifier also offers a direct replacement for a long list of Mercury’s original unregulated rectifier part numbers, including 154-6770, 18-5707, 49184, 62351A1, 62351A2, 70350A1, 70350A3, 72310, 8M0058226, 816770, 816770T, and 9-17100 . Additionally, it replaces Mercury’s older two-wire voltage regulator , part number 88825-A7 , used on many 2.4L and 2.5L race engine blocks. To facilitate installation, a billet aluminum mounting bracket  is available, designed to bolt directly to the top of the V6 powerhead using factory mounting bosses, maintaining a clean, vibration-resistant, and heat-dissipating install location. For owners and builders of Mercury 2.0L, 2.4L, and 2.5L high-performance outboards—especially those running billet flywheels and pushing well above 7,000 RPM—the voltage regulation system must match the increased stator output. The original rectifiers were never designed for this much magnetic energy. Replacing the three-post rectifier with a properly regulated 20-amp unit, and using a compatible bracket that mounts cleanly in place of the original 88825-A7 regulator, is the correct, reliable, and proven approach  to modernizing the charging system for these legacy two-stroke powerhouses.

Monitor and tune your Mercury 2-stroke V6 outboard with precision using the Koso EGT-02R EVO. Learn how to operate the dual EGT and RPM gauge for real-time performance insights, data logging, and engine protection. This guide explains how to operate and fully utilize the Koso EGT-02R EVO digital gauge, focusing on its EGT, RPM, voltage monitoring, recording, playback, and customization features. Designed for high-performance applications, this system is particularly useful for Mercury 2.0L, 2.4L, and 2.5L V6 outboard engines used in racing, tuning, and diagnostics. 1. Understanding the Display and Basic Navigation When powered on, the Koso gauge enters the main screen , which continuously displays real-time engine data. Left Side : Displays EGT Left (port bank), or Max EGT Left when toggled. Right Side : Displays EGT Right (starboard bank), or system voltage when toggled. Bottom Center : Displays current engine RPM, sourced either from a signal wire or inductive pickup. Navigating the Display: Press the Left button  once to switch between live EGT Left and Max EGT Left. Press the Right button  once to switch between live EGT Right and voltage display. Hold the Left button for 3 seconds  while viewing Max EGT Left to clear that value. Hold the Right button for 3 seconds  on the main screen to toggle temperature units between Celsius and Fahrenheit. This intuitive layout allows you to monitor your engine’s thermal behavior and electrical system without diving into submenus. 2. Setting Warning Thresholds and Preferences The gauge allows you to configure alerts for key metrics like EGT and voltage. These warnings are critical for catching lean conditions, detonation, or charging system failures. Entering Settings Mode: Hold both buttons for 3 seconds  from the main screen to enter the settings menu. Once inside the settings screen: Press the Left button  to cycle through setting options: EGT L Warning Temperature EGT R Warning Temperature Low Voltage Warning High Voltage Warning Auto Record Delay Backlight Brightness Press the Right button  to adjust the value of the selected setting. The value will blink to indicate it is being edited. Notes: EGT warning range: 200–1000°C (or 392–1832°F), adjustable in 1° increments. Voltage warnings: Low = 8.0–13.0V, High = 13.0–16.0V, adjustable in 0.1V increments. Backlight brightness: Adjustable from 1 (dim) to 5 (bright). Auto record delay: 0–60 seconds. If no input is detected for 20 seconds, the system will automatically exit back to the main display. 3. Recording Engine Runs Recording is one of the most powerful tools in the EGT-02R EVO. It allows you to log and analyze thermal behavior and engine response over time, such as during acceleration tests or full-throttle passes. To Begin Recording: From the main screen , press both buttons together  to enter the recording mode. Press the Left button  once to begin recording. The “REC” icon will appear and begin blinking. To stop the recording, press the Left button again . The data is now stored. You can record up to 50 sessions , each lasting up to 99 minutes and 59 seconds . 4. Clearing Recorded Data If you need to wipe all previous logs: While in the recording screen, hold the Left button for 3 seconds . The gauge will enter a confirmation screen. Wait a few seconds to complete the data clearing or press either button for 3 seconds to cancel. 5. Playback Mode Playback is especially useful for reviewing engine behavior after test runs or races. It allows you to rewatch EGT and RPM fluctuations and assess the effectiveness of tuning adjustments. To Enter Playback Mode: From the recording screen , press both buttons again  to enter playback. Use the Left button  to select the run you want to view. Use the Right button  to control playback speed. Options include: 1x (real-time playback) 3x (fast-forward) 1/3x (slow motion) Rewind To exit playback and return to the main screen, hold the Right button for 3 seconds . 6. Viewing and Clearing Max EGT Values During operation, the gauge automatically stores the highest recorded EGT for both channels. This is helpful for post-run analysis or spotting potential over-temp conditions that occurred too fast to catch live. To View Max EGT: Press the Left button  from the main screen to switch from live EGT L to Max EGT L. Press the Right button  to view Max EGT R. To Clear Max EGT: While viewing a Max screen, hold the Left button for 3 seconds  to reset the value. This does not affect your recorded sessions—just the live memory of peak values since the last clear. 7. Using the Temperature Unit Toggle The gauge supports both Celsius and Fahrenheit. To change the display unit: Hold the Right button for 3 seconds  from the main screen. The temperature values will switch units accordingly. This toggle is instant and can be done at any time—no need to enter the settings menu. 8. Adjusting Backlight Brightness To adapt the display to sunlight, shade, or night conditions, you can adjust the backlight brightness. Enter the settings menu by holding both buttons for 3 seconds . Scroll to the backlight option using the Left button. Use the Right button to choose a level between 1 (dark)  and 5 (bright) . This setting is stored until manually changed, ensuring consistency between sessions. 9. Visual Warnings and Alerts The gauge will alert you with flashing values if any monitored variable exceeds your preset threshold: If EGT Left or Right exceeds its configured limit, the temperature will blink. If voltage rises above or drops below its set limits, the voltage readout will flash. These visual warnings are essential for real-time awareness during operation, especially under high load or prolonged throttle. 10. Practical Tips for Use Always check Max EGT after a full-throttle pass. High temps can indicate lean conditions or timing issues. Use the data logging feature to compare before-and-after results when making tuning changes (e.g., jetting, ignition). Set voltage alerts conservatively if you're using older batteries or race-specific electrical systems. Toggle between °F and °C depending on your familiarity or team standard. The Koso EGT-02R EVO is not just a readout—it’s a performance tuning and engine protection tool. By understanding and leveraging its features, you can gain deep insights into your engine’s thermal behavior, identify hidden issues before they become expensive failures, and extract maximum performance under safe conditions. Whether you're logging data after every race lap or monitoring for safe cruising, this gauge offers real-time, accurate feedback that supports confident tuning and operation. Koso EGT-02R EVO Dash Manual - Free Download PDF User Guide