Evinrude H300GXA 300HP G2 30″ Mechanical Outboard

The Evinrude H300GXA is a 300hp standard rotation outboard designed with a 30-inch ultra-long shaft for multi-engine offshore boats. This 3.4-liter 74-degree V6 platform produces immense structural density through its 3441 cc displacement while maintaining an optimized dry weight of 558 lbs to maximize pure marine performance. Engineered explicitly for deep-transom configurations, the 30-inch shaft length helps support ideal propeller depth and balanced tracking across heavy-duty fiberglass hulls navigating rough open ocean waters.

The 5400 to 6000 RPM operating range should be matched to the boat, load, propeller, and intended use. The 1.85:1 gear ratio should be matched with an appropriate propeller and boat setup. under heavy loads. This USA-built outboard leverages advanced block harmonics to eliminate low-frequency hull vibrations during severe long-range deep-sea operations.

Slate Gray V6 Platform

An advanced 74-degree V6 direct-injection 2-stroke design treats the cylinder layout of this high-output powerhead to optimize total thermal efficiency. This engineering process shaves critical response lag off the block while drastically improving volumetric efficiency under severe load environments.

Stratified Low RPM Induction

Direct fuel injection sprays gasoline straight into the combustion chambers under high pressure for clean combustion cycles on 87 octane fuel. This delivery is designed to support instant throttle response and crisp acceleration during acceleration and normal operation.

SLX Heavy Duty Housing

Oversized internal gears and a hydrodynamic gearcase 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.

Offshore Deep Transom Match

Offshore fishing center consoles, deep-transom multi-engine setups, coastal sportfishing platforms, and luxury catamarans from 25 to 34 feet are targeted. The ultra-long shaft configuration delivers leverage and structural vibration dampening when driving through steep waves.

On Engine Reservoir Servicing

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