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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.
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.
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 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 2000 Gravity Games, Bartram qualified in 4th from the Moto X Freestyle. He would go on to finish in 3rd place, thereby winning his first ever Gravity Games medal while riding the Yamaha YZ125. At the 2001 Winter X Games V, in Mount Snow, Vermont, Bartram competed in the debut of Moto X Big Air event on snow while riding the Yamaha YZ250F ...