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Home > Art, Film & Photography > Off-Road Motorcycles: 450cc Motocross Bike, Yamaha Yz250, Yamaha Wr250f, Yamaha Wr450f, Yamaha Yz250f
Off-Road Motorcycles: 450cc Motocross Bike, Yamaha Yz250, Yamaha Wr250f, Yamaha Wr450f, Yamaha Yz250f

Off-Road Motorcycles: 450cc Motocross Bike, Yamaha Yz250, Yamaha Wr250f, Yamaha Wr450f, Yamaha Yz250f


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Purchase includes free access to book updates online and a free trial membership in the publisher's book club where you can select from more than a million books without charge. Not illustrated. Excerpt: The 450cc motocross bike or 450 MX bike is a new development in the racing sport motocross. The first 450cc motocross bike was produced in 2002 by Honda Motor Company. In the late 1990s, to try to bring motorcycles with four-stroke engines into racing, the American Motorcyclist Association allowed four-stroke engines with a displacement up to and including 550cc to compete in the 250cc class. The reasoning behind this rule was that a motorcycle with a four-stroke engine would need at least 550c's to compete with the water cooled, high tech two-stroke engines of the time. Soon after the rule announcement, Yamaha began developing a high performance four-stroke machine to compete in the 250cc class. In 1999, it released the YZ400F. This machine featured a dual overhead cam, five-valve, water cooled engine. This engine was mated to a steel chassis that was derived from the YZ250, modified to allow for the larger engine and increased power and torque. Also in 1999, Canondale released the MX400. In 2000, KTM entered competing products 400SX and 520SX. In 2001, Yamaha bored the engine to 426cc and made some other adjustments to the bike design. The new bike was called the YZ426F, and it was in production from 2001 to 2002. Also in 2002 Honda launched its answer to the 400/426. It was called the CRF450R. The CRF was a very similar motorcycle to 400/426, but it featured an aluminum frame and an eccentric UniCam engine. In 2003, Yamaha introduced the YZ450F. This bike was essentially a larger bore version of the 426 with even more tweaks to the chassis, suspension, and transmission. Until 2005, Yamaha and Honda were the only "big four" companies with 450cc motorcycle offerings. That year, Suzuki introduced the RMZ450. In the followin... More: http://booksllc.net/?id=23553656


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Product Details
  • ISBN-13: 9781158231515
  • Publisher: Books LLC
  • Publisher Imprint: Books LLC
  • Height: 152 mm
  • No of Pages: 20
  • Spine Width: 1 mm
  • Weight: 45 gr
  • ISBN-10: 1158231512
  • Publisher Date: 18 Jun 2010
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Sub Title: 450cc Motocross Bike, Yamaha Yz250, Yamaha Wr250f, Yamaha Wr450f, Yamaha Yz250f
  • Width: 229 mm


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Off-Road Motorcycles: 450cc Motocross Bike, Yamaha Yz250, Yamaha Wr250f, Yamaha Wr450f, Yamaha Yz250f
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