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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. Cycle World and Dirt Rider magazines credit it as the bike that started the four-stroke revolution. The 2006 YZ250F and YZ450F were the first production motorcycles equipped with titanium suspension springs.
The WR450F is a version of the YZ450F.
8. September 2009, Yamaha introduced its all-new fifth-generation fuel-injected YZ450F. Changes that have been made, for example, the engine cylinder is tilted backwards, the angle of the crank rod has been changed to ensure more perfect combustion. The 5-valve head is now a 4-valve, the gas tank is located under the seat, the exhaust pipe comes out of the rear of the cylinders, and the air intake is now at the front of the bike. They have a new two-sided frame that allows for new improved steering and new engine components. The motorcycle was presented by Yamaha Factory Motocross rider James Stewart Jr. Top speed was recorded at 80 mph.
