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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 motorcycle was outfitted with a 250cc air-cooled two-stroke, single cylinder engine which was ready to use on dirt roads. The bike had several off-road features including: an aluminum skid plate under the crankcase, Serrated Footpegs, turn signals with supported by rubber mounts. [2]
In 1984, the bike was introduced with Honda's Radial Four Valve Combustion Chamber (RFVC). [citation needed] It has a 110 kg (240 lb) claimed dry weight, [1] and a 36-inch seat height (96–04). Honda claims the engine produces 28 horsepower at 8000 rpm and 17 ft-lb feet of torque. The 1996–2004 versions of the XR250R had 10.6 inches of ...
The bike is completely mechanically operated as there are no hydraulics on the bike. The 250cc 4-stroke motor produces less than 10 horsepower at the wheel. The bike weighs 288 lbs with oil, grease, and petrol. Fuel capacity is 2.4 gallons (9.5 litres). Demand for this model has remained high among collectors and enthusiasts.
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]
The Honda CR250R was a Honda racing dirt bike. The prototype was built in 1971, but it was not until late 1972 that production of the 1973 model "out of the box racers" began sale to the general public. The CR250 was produced for nearly 37 years, 2007 being the final year of production. [2]