Yamaha F250USB 250HP – DEC 30″ Shaft Standard Rotationin Gray

Yamaha F250USB 250HP Digital Offshore

The Yamaha F250USB pairs a high-displacement 4.2L 24-valve DOHC V6 with standard rotation, weighing 553 lbs dry — an industry-leading power-to-weight ratio for modern offshore vessels. The 30-inch extra-long shaft is built for high-transom platforms in Mulmarine’s outboard engine technology lineup requiring consistent propeller immersion.

Peak output holds through the 5000-6000 RPM range, managed by a precision multi-point EFI induction system. The 1.75:1 gear ratio converts engine energy into massive low-end torque for rapid hull planing without hesitation. US offshore anglers lean on this Japan-engineered platform for reliability and the precision of Integrated Electric Power Steering (DES).

Technical Specifications of Yamaha F250USB

• The V6 4.2L DOHC architecture delivers 250 horsepower with strong volumetric marine efficiency.
• The 251 kg build runs a 30-inch extra-long shaft for specialized transom configurations.
• Precision multi-point EFI keeps combustion consistent across the 5000-6000 RPM throttle band.
• Integrated Electric Power Steering (DES) delivers effortless handling and precise control at any speed.
• Digital Electronic Control (DEC) with Helm Master EX compatibility keeps shifting and helm management smooth.
• The 50-70 Amp alternator output keeps navigation displays and digital electronics powered.
• Coverage comes from a 3-year limited factory warranty and Japanese build standards.

V6 4.2L DOHC Engine

The F250USB’s 24-valve V6 configuration maximizes air intake and torque, delivering hole-shot acceleration when pushing a loaded offshore vessel through chop.

Integrated Electric Steering

Integrated Electric Power Steering (DES) gives a smooth, responsive experience without external hydraulic lines, keeping the bilge clean and reducing operator fatigue on long tournament days.

30-Inch Extra-Long Shaft

The 30-inch shaft is calibrated for high-transom vessel dimensions, preventing propeller aeration while holding secure mechanical leverage through turns.

Helm Master EX Integration

This engine is fully compatible with Yamaha Helm Master EX for advanced positioning and joystick control at the helm.

Yamaha Quality Warranty

This engine includes a 3-year limited factory warranty covering essential mechanical systems and structural components against manufacturing defects.

Offshore Hull Compatibility

This 250HP motor suits high-performance fiberglass hulls needing extra-long shaft length, with a 553 lbs build balancing stability and planing speed.

Routine Care Protocol

This digital V6 runs high-quality sacrificial anodes to keep galvanic corrosion in check daily. Pro Tip: flush the engine with fresh water after every launch to maintain the cooling system and protect internal components.