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  2. 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. In 2003 it received an aluminum subframe, which was replaced in the 2006 model with an all-aluminum frame.

  3. Yamaha YZ250 - Wikipedia

    en.wikipedia.org/wiki/Yamaha_YZ250

    The Yamaha YZ250 is a two-stroke motocross race bike made by Yamaha. The model was launched in 1974, and has been regularly updated and is still in production with new releases every year. The model was launched in 1974, and has been regularly updated and is still in production with new releases every year.

  4. 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 ...

  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 WR250F - Wikipedia

    en.wikipedia.org/wiki/Yamaha_WR250F

    The Yamaha WR250F is an off-road motorcycle made by Yamaha Motor Company.It has a 250 cc (15 cu in) liquid-cooled single nikasil coated cylinder engine. First offered in 2001, it shared many components and design concepts with the YZ250F motocross model.

  7. List of fastest production motorcycles by acceleration

    en.wikipedia.org/wiki/List_of_fastest_production...

    A Suzuki GSX-R1000 at a drag strip – a 2006 model once recorded a 0 to 60 mph time of 2.35 seconds. This is a list of street legal production motorcycles ranked by acceleration from a standing start, limited to 0 to 60 mph times of under 3.5 seconds, and 1 ⁄ 4-mile times of under 12 seconds.

  8. Yamaha XTZ 250 - Wikipedia

    en.wikipedia.org/wiki/Yamaha_XTZ_250

    White 2011 XTZ 250 Tenere. The Yamaha XTZ 250 is a dual-sport motorcycle designed and produced by Yamaha Motor do Brasil, starting in 2006.It is a variant of the XT250, which is marketed worldwide, and derives from the 1975 XT500 model, which established a successful range of dual-sport motorcycles, including the XT600 Ténéré, that greatly contributed to Yamaha's image.

  9. 2024 AMA National Motocross Championship - Wikipedia

    en.wikipedia.org/wiki/2024_AMA_National...

    The 2024 AMA Motocross Championship season is the 53rd AMA Motocross National Championship season, the premier motocross series in USA. Jett Lawrence goes into the season as the defending champion in the 450 class, after winning every race on the way to title in 2023.