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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 YZ450F received a major update in 2006, with over 300 parts changed and improved. The power was smoothed out, and the bike was made easier to ride, putting to rest the complaint that the YZ had too much power. [13] The transmission was returned to a more traditional five-speed.
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]
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.
The top speed of the stock production vehicle has not been clearly defined by an independent, verifiable source. Otherwise, first electric vehicle to be considered for the position of the world's fastest street-legal production motorcycle, [ 37 ] [ 38 ] [ 39 ] to have won against ICE motorcycles in a professional road-based event and to have ...
The 2005 model has a constant-mesh, wet, multiple-disc coil-spring clutch. From 1973 through 2004, the YZ125 had a single backbone frame made from steel. It generally averaged from 176 to 198 lb (80 to 90 kg). [citation needed] For the 2005 year, Yamaha switched to a single backbone frame constructed from an aluminum alloy. This frame material ...
Top speed 154 mph (248 km/h) [7] 154 mph (248 km/h) [7] 153.6 mph (247.2 km/h) [7] 160 mph (260 km/h) [1] Chassis Brakes/Front Dual 298mm floating discs w/4-piston calipers Dual 320 mm floating discs; forged monoblock 4-piston Sumitomo calipers Brakes/Rear Single 267mm disc w/2-piston caliper 245mm disc w/ single-piston pin-slide Nissin caliper