One of the most noticeable steering upgrades you can make to a high-performance boat is replacing the standard SeaStar Pro 2.0 cu. in. (33cc/rev) hydraulic helm with the Buckshot Racing #77 Pro 2.3 cu. in. (37cc/rev) or 2.7 cu. in. (44cc/rev) hydraulic helm pump.
The larger-displacement helm moves more hydraulic fluid with every revolution of the steering wheel. This allows the steering cylinder to travel farther with less wheel movement, reducing steering travel while producing quicker engine response.
Instead of waiting for the engine to react after several turns of the wheel, steering input is transferred almost immediately, creating a much more connected feel between the driver and the boat.
Fewer Turns Lock-to-Lock
Most factory SeaStar Pro 2.0 cu. in. helms require approximately 4 to 5 turns lock-to-lock. Upgrading to the 2.3 cu. in. helm typically reduces steering travel to approximately 3 to 4 turns, while the 2.7 cu. in. helm can reduce steering travel to approximately 2.5 to 3 turns, depending on the steering cylinder installed.
The reduced steering travel allows much faster steering corrections, which becomes increasingly important as boat speed climbs. At speeds above 80 MPH, even a small steering correction can determine whether the boat remains balanced on the pad or begins to wander.
Better Control at Speed
High-performance hulls demand constant steering input. Pad boats, tunnel hulls, drag boats, Mod-VP boats, offshore V-bottoms, and catamarans all require continuous steering corrections to compensate for propeller torque, chine walk, wind, boat wakes, and changing water conditions.
Because the Buckshot Racing #77 Pro Helm moves more oil with every revolution, steering response becomes quicker and more predictable. The boat reacts immediately to driver input, making it easier to hold a straight line during top-speed runs or make smooth, controlled turns without excessive wheel movement.
The improvement is especially noticeable on popular performance boats such as STV River Rocket, STV Euro, Allison XB2002, Allison XB21, QuarterShot T-3, Mirage Jaguar, Triad V-21, Liberator, HydroStream, Bullet, Cougar, Skater, Motion, and Eliminator hulls.
Reduced Driver Fatigue
A quicker steering ratio also reduces driver fatigue. Since fewer steering wheel rotations are required throughout the day, drivers make smaller, more natural corrections instead of constantly feeding the wheel back and forth.
During long poker runs, offshore races, endurance events, or all-day lake trips, this reduction in steering movement helps the driver remain more relaxed while maintaining precise boat control.
Steering Effort
The only trade-off when increasing helm displacement is a slightly firmer steering feel. Because the larger helm moves more hydraulic fluid with every turn, steering effort increases slightly compared to the factory 2.0 cu. in. helm.
Most experienced performance boaters quickly adapt to the additional effort and often prefer the improved steering feedback. Boats equipped with SeaStar Power Assist typically show little or no noticeable increase in steering effort while still benefiting from the quicker steering ratio.
Direct Replacement
The Buckshot Racing #77 Pro Hydraulic Helm is a direct replacement for many popular SeaStar Pro front-mount helm pumps, including HH5770, HH5771, HH5774, HH5290, HH5773, HH5778, and HH5779. It installs using the existing SeaStar Pro steering system, making it an excellent upgrade for performance outboards without requiring major modifications.
The upgrade is commonly used with Mercury Racing 300R, 300XS, 300X, 250R, 250XS, 250 Pro XS, 225 Pro XS, 200 Pro XS, and other high-performance outboards equipped with SeaStar Pro hydraulic steering.
Buckshot Racing #77 Tech Tip
For most recreational performance boats, bass boats, STVs, Allisons, and lake hot rods, the 2.3 cu. in. helm offers an excellent balance between quick steering and comfortable steering effort.
Drivers competing in drag racing, tunnel boat racing, APBA, ODBA, DSRA, SODA, or UIM competition often prefer the 2.7 cu. in. helm because it delivers the quickest steering response with the fewest turns lock-to-lock.
Final Thoughts
The Buckshot Racing #77 Pro 2.3 and 2.7 cu. in. Hydraulic Helm Pumps provide one of the most effective steering upgrades available for high-performance outboards and offshore boats. By reducing steering travel, improving response, and increasing steering precision, they give drivers greater confidence during top-speed runs, rough-water operation, and competitive racing.
Whether you're running a Mercury 2.0 Liter, 2.4 Liters, 2.5 Liter, 3.0 Liter, 3.2 Liter, 150HP, 175HP, 200HP, 260 EFI, 280 ROS, 300R, 300XS, 300X, 250R, 250XS, 250 Pro XS, 225 Pro XS, or another performance-powered boat, upgrading from the standard SeaStar Pro 2.0 cu. in. helm delivers faster, more predictable handling with the precision serious boaters expect.
For personalized guidance, contact Buckshot Racing #77 at mike@buckshotracing77.com or call 714-697-1716 to discuss the optimal helm size for your specific boat and needs.