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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 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.
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.
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 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 ...
2005 2006–2007 2008-2009 [6] 2010-2012 [6] Engine Type 998 cc, liquid-cooled, 20-valve, DOHC, in-line four-cylinder Bore x Stroke 74 x 58 mm 77 x 53.6 mm Carburetion (4) 37 mm Mikuni (model BSR37 x 4) CV w/ throttle position sensor (TPS) 32-bit Mikuni R1-based Electronic Fuel Injection, 45mm throttle bodies w/ throttle position sensor (TPS)
2005 [4] 2006 [5] 2007 [5] [2] 2008 [6] 2009 [7] Engine Engine Type 600 cc, liquid-cooled, inline 4-cylinder Bore/Stroke 65.5 mm × 44.5 mm (2.58 in × 1.75 in) Compression Ratio 12.1:1 Valve train DOHC, four valves per cylinder Carburetion Group fuel injection, 36 mm throttle bodies Ignition Digital TCI Drivetrain Transmission