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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. In 2003 it received an aluminum subframe, which was replaced in the 2006 model with an all-aluminum frame.
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.
Additionally, the YZF's weight was decreased from its original 250 lb (110 kg) to 233 lb (106 kg). The bike made tremendous power; however, many thought that the bike had too much power for a motocross track. [12] The 2005 YZ450F was the first YZ450F to feature KYB twin chamber cartridge forks.
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] YC-1 (1956) was the second bike manufactured by Yamaha; it was a 175 cc single cylinder two-stroke. [1] YD-1 (1957) Yamaha began production of its first 250 cc, two-stroke twin, the YD1. [1]
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.
At the 2001 Winter X Games V, in Mount Snow, Vermont, Bartram competes in the debut of Moto X Big Air event on snow, and also he was riding the Yamaha YZ250F, and finished in 5th in the debut of Moto X Big Air event. In May of 2001, Bartram switch from the 125 to the KTM 250, which is a heavy dirt bike.
The engine is based on Yamaha's highly successful and dependable YZ250F dirt bike engine. With a 487-pound estimated dry weight, it is one of the lightest production four-strokes. The 2007-era Yamaha Phazer was discontinued at the end of the 2018 model year amidst Yamaha's restructuring of their model lineups for 2019. [2]
The Yamaha X-City 125/250 is a large-wheeled, fuel-injected Maxiscooter introduced in 2007, with either a 125 cc or 250 cc engine — both water-cooled, four-stroke, catalytic-converter-equipped and Euro 3 compliant. The models are internally designated VP125 and VP250, respectively, and each features a fully automatic transmission.