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  2. Yamaha YZ250 - Wikipedia

    en.wikipedia.org/wiki/Yamaha_YZ250

    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.

  3. List of Yamaha motorcycles - Wikipedia

    en.wikipedia.org/wiki/List_of_Yamaha_motorcycles

    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]

  4. Yamaha YZR250 - Wikipedia

    en.wikipedia.org/wiki/Yamaha_YZR250

    Main page; Contents; Current events; Random article; About Wikipedia; Contact us; Pages for logged out editors learn more

  5. Yamaha YZ250F - Wikipedia

    en.wikipedia.org/wiki/Yamaha_YZ250F

    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.

  6. Yamaha YZ450F - Wikipedia

    en.wikipedia.org/wiki/Yamaha_YZ450F

    The Yamaha YZ450F is a four-stroke racing motocross bike built by Yamaha Motor Corporation.It was the successor to the previous YZ426F which was discontinued in 2003. It is credited by Cycle World and Dirt Rider magazines as the bike that started the four-stroke dirt bike revolution.

  7. Two-stroke power valve system - Wikipedia

    en.wikipedia.org/wiki/Two-stroke_power_valve_system

    A stroke is the action of a piston travelling the full length of its cylinder.In a two-stroke engine, one of the two strokes combines primarily the intake stroke and the combustion stroke, while the other stroke primarily combines the compression stroke and the exhaust stroke, though technically since both ports are exposed during both the combustion and compression strokes, some reversion ...

  8. Yamaha Motor Company - Wikipedia

    en.wikipedia.org/wiki/Yamaha_Motor_Company

    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.

  9. Yamaha TZ 250 - Wikipedia

    en.wikipedia.org/wiki/Yamaha_TZ_250

    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).

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