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  2. Yamaha YZ125 - Wikipedia

    en.wikipedia.org/wiki/Yamaha_YZ125

    The YZ125 has a 124 cc (7.6 cu in) reed valve-inducted two-stroke engine. It was air cooled from 1974 to 1980, and liquid cooled since 1981. It has a Mikuni 38 mm TMX series carburetor. [6] The engine produces 35 hp (26 kW). [1] The YZ125 has been built with five- or six-speed manual sequential gearbox depending on model year.

  3. 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 ]

  4. 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 ...

  5. 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]

  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 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.