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The two-stroke line was also the first to receive a second bike, a 250 cc (15 cu in) counterpart. In 1991, Leitner sold ATK to an investment company , [ 8 ] who would move the corporation to Utah. The new owners would expand the product line-up greatly, offering a second four-stroke, the 350, as well as electric-start and lightened variations ...
By 1994, the displacement limit of a four-stroke power motocross bike was up to 550 cc in the 250 class, to incentivize manufactures to further develop the design for use in motocross. [8] In 2006, the 250 cc division was renamed the MX Class, with an engine formula allowing for 150–250 cc two-stroke or 250–450 cc four-stroke machines. [9]
The PR3, PR4 & PR5 have 4-stroke single-cylinder engines closely based on the Honda XR series engines; and the AJP PR series bikes may be seen as updated equivalents of Honda's XR200 & XR250 of the 1980s. Each AJP bike has a modern lightweight frame, front & rear disc brakes, a cast-alloy swingarm and a lightweight composite silencer.
The Kawasaki KX 250F is a liquid-cooled DOHC 249 cc (15.2 cu in) four-valve four-stroke single motocross motorcycle made by Kawasaki. The Kawasaki KX250F was co-developed with the Suzuki Motor Co. under their unique joint venture that started in 2002. This joint venture produced the Suzuki RMZ250 which is the mechanical twin to the KX250F but ...
Fuel injection was introduced to the 350 cc 4-stroke. [12] 2016 saw the addition of the 350 to the RS line. Oil injection was added to the 250 and 300 2-strokes. The remaining 4-strokes 390, 430 and 480/500 received fuel injection. All 4-stroke models now come with plastic skid plates and translucent fuel tanks. [12]
The championship consists of eleven rounds at eleven major tracks all over the continental United States. There are three classes: [23] the 250cc Motocross Class for 150–250 cc 4-stroke machines, the 450cc Motocross Class for 251–450 cc 4-stroke machines and a 250cc Women's Class, using the same rules as men's 250cc. Race events take place ...
Henry would race the production version of the prototype four-stroke, the YZ400F, for 1998. This machine started the four-stroke revolution in motocross. He battled through a strong but unspectacular supercross season where he finished 7th overall. The outdoor season would be Henry's chance to show the bike's true capabilities.
The 250 four-strokes received an all new engine, new exhaust system and an all new ECU. The 250/350 4-stroke frames were improved and made lighter and more nimble. The lower triple clamp was redesigned to ensure a smoother fork action. Finally, all models received a new improved Trail Tech speedometer. 4-stroke Enduro: FE 250 - 250 cc enduro