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The original YZ250 of 1974 used an air-cooled 250cc two-stroke engine of 70 mm bore and a 64 mm stroke, which was improved semi-annually. The air-cooled motor was replaced in 1982 with a 249 cc liquid-cooled two-stroke reed-valved engine with a mechanical, rather than servo-driven, YPVS exhaust valve for a wider spread of power.
YDS-3 (1964) 246 cc, two-stroke, parallel-twin, it used the world's first oil injection lubrication system in a 2-stroke engine. [2] DT-1 (1968) Yamaha's first true off-road motorcycle. [1] XS-1 (1970) Yamaha's first four-stroke engine motorcycle (650 cc twin). [3] YZ Monocross (1975) First production motocross bike with a single rear shock. [3]
Points received by each finisher, from first 1st place to 15th place: 25, 20, 16, 13, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1. Historically, there have been several points systems . [ 4 ] Results from all current Grands Prix count towards the championships; in the past, only a certain number of results were counted.
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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.
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The YA-1 was followed by the YA-2 of 1957, another 125cc two stroke, but with significantly improved frame and suspension. [9] The YD-1 of 1957 was a 250cc two-stroke twin cylinder motorcycle, resembling the YA-2, but with a larger and more powerful motor.
The basis of the production-volume racer was the OW17 factory machine from Yamaha, which was used in the motorcycle world championship from 1973 to 1990, and with which Dieter Braun became motorcycle world champion in the class up to 250 cm 3 in 1973. The almost identical Yamaha TZ 350 was manufactured with a larger bore (64 instead of 54 mm).