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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 ...
Yamaha started development of the OX66 in 1984 [1] as a design concept for a lightweight and compact Formula Two engine with a wide power band.. At the time of development, both BMW and Honda provided engines for F2 (in the form of the M12/7 inline-four and the RA260E V6 respectively), but Honda's engine yielded superior results despite limited use.
In 1967 a new larger displacement model was added to the range, the 350cc two stroke twin R-1. In 1968, Yamaha launched their first four-stroke motorcycle, the XS-1/650 which was a 650cc four-stroke twin, a larger and more powerful machine that equaled the displacement and performance of the popular British bikes of the era, such as the Triumph ...
"Cutaway of Yamaha Genesis inline-four 20-valve engine" The DOHC Genesis engine has five valves per cylinder and downdraft carburetors. Yamaha adopted the 5-valve concept, using three intake valves and two exhaust valves per cylinder, because it allowed both excellent volumetric efficiency and high RPM. As designers began to appreciate the ...
The first bike manufactured by Yamaha was actually a copy of the German DKW RT 125; it had an air-cooled, two-stroke, single cylinder 125 cc engine [1] YC-1 (1956) was the second bike manufactured by Yamaha; it was a 175 cc single cylinder two-stroke. [1] YD-1 (1957) Yamaha began production of its first 250 cc, two-stroke twin, the YD1. [1]
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.
The Yamaha YZ250F is a motocross motorcycle first released in 2001 by Yamaha. It features a DOHC , four-stroke engine and initially had a steel frame and subframe in 2001–2002. In 2003 it received an aluminum subframe, which was replaced in the 2006 model with an all-aluminum frame.
60 degrees: 2001–2017 Harley-Davidson VRSC, 2014–2021 Harley-Davidson Street, 1998–2003 Aprilia RSV Mille, 1988–present Yamaha XV250, 2001–present Yamaha DragStar 250, 2015–present Indian Scout; 70 degrees: 1982–1983 Yamaha XZ 550, 1988–1998 Suzuki RGV250, 1987–2004 Yamaha Virago 535, 1997–present Yamaha DragStar 650
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