Yamaha VF115LB 115HP VMAX SHO Mechanical Outboard 20″

The Yamaha VF115LB is a 115hp standard rotation outboard designed with a 20-inch shaft for multi-engine offshore boats. This 1.8-liter inline-4 platform produces immense structural density through its 1832 cc displacement while maintaining an optimized dry weight of 377 lbs to maximize pure marine performance. Engineered explicitly for low-transom configurations, the 20-inch shaft length helps support ideal propeller depth and balanced tracking across heavy-duty fiberglass hulls navigating rough open ocean waters.

The 5300 to 6300 RPM operating range should be matched to the boat, load, propeller, and intended use. The 2.15:1 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.

DOHC High Performance Architecture

A 16-valve double overhead camshaft design treats the cylinder layout of this inline-4 block to optimize total thermal efficiency. This engineering process shaves critical response lag off the powerhead while drastically improving volumetric efficiency under severe tournament environments.

Sequential Track Fuel Induction

Electronic fuel injection sprays gasoline straight into the intake tracks for clean combustion cycles on 87 octane fuel. This delivery system is designed to support immediate throttle response and flawless cold starts during changing early morning coastal marine conditions.

High Performance Sport Lower Unit

Oversized internal gears and a 2.15:1 gear ratio profile minimize underwater drag at high cruising speeds. This structural configuration mitigates lower-unit gear chatter and helps support smooth power transmission to the hub during tight cornering maneuvers.

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 spoiling oil.Maintenance note: Follow the manufacturer’s service procedures and lubrication specifications for the engine and gearcase.