Mercury Pro Max 300X Outboard: Brainy Brawn

Mercury Pro Max 300X: The tough and sophisticated outboard delivers loads of power

20th December 2001.
By Staff

The Pro Max 300X outboard from Mercury Racing cranks out more than 300 horsepower.

The Pro Max 300X outboard from Mercury Racing cranks out more than 300 horsepower.

Rated at more than 300 horsepower, Pro Max 300X is the most powerful outboard on the market. The outboard has an all-new powerhead, from its cylinder block to its high-flow fuel-injection system.

The block features high-performance cylinder porting and machined exhaust. These developments combined with a PCM 555 processor and a new exhaust tuner reportedly give the engine a 10-percent horsepower boost and an added 700 rpm of operating range over its predecessor, the Pro Max 300.

The injection system has a custom reed-plate assembly with rubber-coated reed blocks sporting single-stage, carbon-fiber reeds. The custom reed plate supports side-mounted fuel injections fed by an anodized aluminum fuel rail.

To operate its efficient electronic oil-injection system, the engine taps the brains of the PCM 555 processor. A system called “Engine Guardian” monitors 64 internal engine functions. Real-time data appears on the SmartCraft SC100 that comes with the outboard.

Pro Max 300X engines are with either the 20-inch center section with standard integral trim or the heavy-duty offshore swivel/transom-bracket assembly with single-ram trim. The new 1.75:1 Torque Master gearcase with dual water pickups is offered with the standard package. The 1.62:1 Sport Master gearcase is offered with the offshore package.

For more information

Mercury Racing
N7480 County Road UU
Fond du Lac, WI 54935
(920) 921-5330

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