Yamaha LF350XSA2 350HP 25″ Counter-Rotation Outboard

The Yamaha LF350XSA2 is a 350hp counter rotation outboard designed with a 25-inch shaft for multi-engine offshore boats. This 4.3-liter 60-degree V6 platform produces immense structural density through its 4256 cc displacement while maintaining an optimized dry weight of 629 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 1.75:1 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.

Counter Rotating Propeller Gearcase

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.