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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 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 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 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]
After 3 years of design, the all-new 2012 WR450F was released and featured a 2012 YZ250F frame, KYB SSS forks, fuel injection, and an altered motor position. [10] Per Yamaha's designers, the only modifications required to the YZ250F chassis were updated motor mounts. [10] The engine was rotated back to move the center of gravity and improve ...
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 ...
2002 Team Yamaha USA 2nd Place AMA SX 250 2001 Team Yamaha USA 8th Championship US SX 250 5th Championship US MX 250 King Of Supercross de Paris Bercy (250) Winner of the SX Stade de France in Paris, France Winner Motocross des Nations (with Seguy and Demaria) 2000 Team Yamaha USA Winner SX US 250 : 4 victories 4th MX US 250 : 2 victories at ...
The 2001 model received a good review from Motorcycle-USA.com [10] The updated 2006 model received a good review from Motorcycle-USA.com [11] The 2006 model received a good review from Cycle World [12] FZ1 came second in a Rider Magazine Naked bike comparison [13] The 2009 model received an excellent review from Two Wheel Freaks [14]