Yamaha LXF450XSA2 450HP XTO Counter-Rotation DEC 25″

The Yamaha LXF450XSA2 is a 450hp counter rotation outboard designed with a 25-inch shaft for multi-engine offshore boats. This 5.6-liter V8 platform produces immense structural density through its 5559 cc displacement while maintaining an optimized dry weight of 963 lbs to maximize pure marine performance. Engineered explicitly for mid-transom configurations, the 25-inch shaft length helps support ideal propeller depth and balanced tracking across heavy-duty fiberglass hulls navigating rough open ocean waters.

The 5000 to 6000 RPM operating range should be matched to the boat, load, propeller, and intended use. The 1.79:1 gear ratio should be matched with an appropriate propeller and boat setup. under heavy loads. This Japanese-built outboard leverages advanced block harmonics to eliminate low-frequency hull vibrations during severe long-range deep-sea operations.

V8 Plasma Fusion Block

Plasma fusion technology creates micro-textured cylinder walls in this sleeveless 32-valve double overhead camshaft V8 to maximize overall thermal efficiency. This offshore engineering process shaves critical pounds off the powerhead while drastically improving heat dissipation under severe offshore environments.

Direct Fuel Injection System

Direct fuel induction sprays gasoline straight into the combustion chambers under 2900 PSI of high pressure for cleaner combustion cycles. This delivery system is designed to support immediate throttle response and flawless cold starts during changing early morning coastal marine conditions.

Counter Rotating Gearcase Profile

Oversized internal gears and a streamlined lower unit maximize hydrodynamic thrust while canceling out heavy steering pull on multi-engine alignments. This mechanics minimizes lower-unit chatter while ensuring steady propeller tracking when backing down on game fish.

Cowling Access And Lubrication

Fast access to critical checking points is provided by a multi-piece outer cowling structure that cuts service times down significantly. Changing the internal fluid volume remains completely clean thanks to an engineered drain plug location that prevents spilling oil.Maintenance note: Follow the manufacturer’s service procedures and lubrication specifications for the engine and gearcase.