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Four-stroke outboards have been sold since the late 1920s, such as the Roness and Sharland. In 1962 Homelite introduced a four-stroke outboard a 55-horsepower (41 kW) motor, based on the four-cylinder Crosley automobile engine. This outboard was called the Bearcat and was later purchased by Fischer-Pierce, the makers of Boston Whaler, for use ...
"Genesis" is Yamaha's marketing name for a range of innovative, high-performance multi-valve four-stroke motorcycle engines. [1] The flexible design of the engine allowed Yamaha to use it on a variety of configurations, from sport bikes to outboard engines.
It has an increased displacement of 5.6-litres achieved by increasing the bore diameter from 94 to 96 mm (3.70 to 3.78 in). The stroke remains the same, however the compression ratio is now 12.0:1. It also utilizes a gasoline direct injection system, a first for a 4-stroke outboard engine, and it requires 89 Octane rated fuel.
Four-stroke cycle used in gasoline/petrol engines: intake (1), compression (2), power (3), and exhaust (4). The right blue side is the intake port and the left brown side is the exhaust port. The cylinder wall is a thin sleeve surrounding the piston head which creates a space for the combustion of fuel and the genesis of mechanical energy.
In 1988, Yamaha introduced a 130 hp (97 kW) two-stroke V4 to the US market with what was called "precision blend" oil injection. [26] Most of the outboard motors are usually two-stroke engines with a carburetor.
Yamaha continued on with both the two-stroke line and four-stroke twins at a time that other Japanese manufacturers were increasingly moving to four cylinder four-stroke machines, a trend led by Honda in 1969 with the legendary CB750 four-stroke four-cylinder cycle.
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