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The bike had an 11,600 rpm redline [8] [better source needed] power and torque close to its 250 cc two-stroke rivals. [1] It benefited from engine compression braking, which allowed the engine to slow the bike down during deceleration, giving the brakes a rest. [1] The 1998 YZ400F was the first bike to come stock with a Keihin FCR carburetor ...
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 ...
2005 MC 250 Motocross bike. GasGas Motorcycles's enduro lineup includes models like the EC and EX series, which are built for long-distance off-road riding. The FSE and FSR are the fuel injected, four-stroke enduro bikes similar in appearance to the EC models. In 2007–2009, the company standardized the color red for all displacements and models.
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 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 ...
The WR400F is related to the YZ400F, a motocross model. Like the YZ400, it was considered to be a groundbreaking model in motorcycle history, ushering in the four-stroke era which ended the dominance of two-stroke engines in motocross and offroad racing. While many modern performance four-stroke dirt bikes have been criticized for excessive ...
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 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.