The Buckshot Racing #77 Mercury Racing Hi-Flow Trim Pump Base Assembly is engineered for serious Mercury Marine and Mercury Racing applications where trim speed, hydraulic response, durability, and configurability matter.
 
Built around the proven Parker / OilDyne hydraulic pump platform, this assembly is designed specifically for high-performance long ram and short ram trim systems used on offshore boats, drag boats, lake-race setups, bass boats, center consoles, and Mercury Racing outboards.
 
Unlike standard replacement trim pumps, this assembly features a hi-flow gear set and race-calibrated valve configuration designed to improve hydraulic response and support faster trim operation under high-load, high-speed marine conditions.
 
Each assembly comes ready to pair with the compatible trim motor of your choice and can be configured at checkout with multiple reservoir and fitting options depending on your rigging setup.
 
Faster Trim Response for High-Performance Boats
 
In performance boating, trim response directly affects acceleration, hull attitude, propeller efficiency, rough-water handling, and top-end speed. Standard recreational trim pumps are often too slow or restrictive for aggressive surfacing-propeller applications and Mercury Racing setups.
 
The Buckshot Racing #77 Hi-Flow Trim Pump Base uses an upgraded internal gear set and race-style valve calibration to improve hydraulic oil flow and increase trim response speed. This helps the system react faster during acceleration, rough-water corrections, and high-speed trim adjustments.
 
The system is designed for demanding Mercury Racing and high-performance applications, including the Mercury Racing 260 EFI, 280 ROS, 300 Drag, 300X, 300XS, 300R, 400R, 450R, and 500R along with offshore catamarans, surfacing-prop center consoles, poker run boats, drag boats, bass boats, and high-performance lake boats.
 
Reservoir Options — Select at Checkout
 
Buckshot Racing #77 offers two reservoir configurations depending on your rigging preference.
 
Option 1 — Mercury Racing Style 3.5" Steel Reservoir
 
This option uses the traditional Mercury Racing-style steel reservoir commonly found on many factory high-performance trim systems. It provides excellent durability along with the classic Mercury Racing appearance preferred on many offshore and restoration builds.
 
Option 2 — Lightweight Plastic Reservoir w/ Yellow Cap
 
The plastic reservoir option offers reduced weight and excellent corrosion resistance, making it popular for modern performance builds and custom rigging applications.
 
Both reservoir options utilize the same hi-flow pump base and race valve assembly.
 
Hydraulic Fitting Options — Select at Checkout
To support multiple Mercury Racing and Mercury Marine trim configurations, Buckshot Racing #77 offers three fitting options.
 
Option 1 — Dual #3 Brass Female Fittings
 
This setup uses two female -3 JIC hydraulic fittings and is commonly used on many factory Mercury short ram trim systems and compact hydraulic line setups.
 
Option 2 — Dual #4 Brass Female Fittings
 
This configuration uses two female -4 JIC fittings and is commonly preferred for many long ram trim systems and higher-volume hydraulic applications requiring increased fluid flow capacity.
 
Option 3 — One #4 Steel Male and One #4 Brass Female Fitting
 
This mixed fitting arrangement is commonly used on certain Mercury Racing and custom hydraulic setups where hose routing requires both a male and female -4 fitting configuration.
 
Option 4 — Dual #4 Steel Male Fittings
 
This option allows the trim pump assembly to integrate cleanly into a wide variety of aftermarket lines without requiring additional adapters or modifications.
 
Compatible with Mercury / OilDyne Trim Motors
 
The Buckshot Racing #77 Hi-Flow Trim Pump Base is compatible with many Mercury / Parker / OilDyne-style trim motors commonly used on Mercury Marine and Mercury Racing trim systems.
Compatible motor references commonly include Mercury 17649A1, 17649, 891736T, 87828, ARCO 6218, and Sierra 18-6772.
 
Select ROS Race Motor for a full custom build
 
The system supports standard 12V trim systems as well as high-speed 24V and 36V trim motor setups commonly used in competitive racing and offshore applications.
 
Designed for Long Ram & Short Ram Systems
 
Unlike many generic replacement trim pumps, this assembly is specifically designed to support both long ram and short ram Mercury trim systems.
 
Short ram systems are commonly used on compact offshore mids and performance Mercury Racing setups where rapid trim response is critical. Long ram systems are often found on heavier offshore boats and higher-horsepower applications requiring increased trim cylinder travel and hydraulic force.
 
The hi-flow gear set and race valve configuration are engineered to support both styles effectively.
 
OEM & Cross Reference Information
 
This Mercury Racing Hi-Flow Trim Pump Base Assembly corresponds to multiple Mercury and aftermarket references including: 6270, 92459A4, 92459A3, 92459A8, 823653A5, 823653A9
18-6765.
 
These part numbers are commonly associated with Mercury Racing and Mercury Marine OilDyne/Parker hydraulic trim pump systems.
 
Built for Harsh Marine Environments
 
The pump base assembly is finished with a durable marine-grade protective coating designed to resist corrosion, oxidation, moisture exposure, and long-term marine wear.
 
Combined with the upgraded internal gear set, race valve calibration, and flexible hydraulic configurations, this makes the Buckshot Racing #77 Hi-Flow Trim Pump Base one of the most configurable and performance-oriented Mercury Racing trim pump assemblies available today.
 
Whether rigging a 300R offshore catamaran, restoring a 280 ROS lake-race setup, or upgrading a custom Mercury hydraulic trim system, this pump base is engineered to deliver the speed, reliability, and hydraulic performance demanded by today’s serious boaters.
 
For technical questions, contact mike@buckshotracing77.com or call (714) 697-1716.