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  2. Yamaha YZ125 - Wikipedia

    en.wikipedia.org/wiki/Yamaha_YZ125

    The Yamaha YZ125 is a motocross racing motorcycle with a two-stroke 124.9 cc (7.62 cu in) displacement single-cylinder engine made by Yamaha since 1974. It is available to the public. It is available to the public.

  3. Two-stroke power valve system - Wikipedia

    en.wikipedia.org/wiki/Two-stroke_power_valve_system

    The only moving parts inside simple two-stroke engines are the crankshaft, the connecting rod, and the piston. It is the same simplicity in design, however, that causes a two-stroke engine to be less fuel-efficient and produce high specific levels of undesirable exhaust gas emissions. At the bottom of the power stroke, the transfer ports, which ...

  4. List of Yamaha motorcycles - Wikipedia

    en.wikipedia.org/wiki/List_of_Yamaha_motorcycles

    Yamaha YA-1. YA-1 built August 1954, produced January 1955. 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]

  5. Harris Performance Products - Wikipedia

    en.wikipedia.org/wiki/Harris_Performance_Products

    Harris Performance Products are a British-based motorcycle racing and parts manufacturer. The business started in Roydon , Essex , England making replacement chassis for road racing , housing Yamaha TZ250/TZ350 engines using a monoshock rear suspension layout. [ 1 ]

  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. Yamaha Motor Company - Wikipedia

    en.wikipedia.org/wiki/Yamaha_Motor_Company

    Yamaha bucked this trend and continued to refine and sell two-strokes for the street into the 1980s. These bikes were performance oriented, water-cooled twin cylinder machines, designed to achieve excellent performance taking advantage of the lower weight of two strokes. The RZ-250 of 1980 [14] was the progenitor of this series.