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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. Although other ...
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Kocinski at the 1990 Japanese Grand Prix. 1989 was also the year of his 500cc World Championship debut. In 1990 he raced in four different championships, but the highlight was winning the 250cc World Championship in his first full season on a Team Roberts Yamaha YZR250. [1]
Yamaha YA-1. YA-1 built August 1954, produced January 1955. 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]
The TZR250 was still raced in the Yamaha Past Masters race series with the British racing club as of 2024. [4] Racing engines are currently claiming about 56 hp (42 kW) at 11,000 rpm. [citation needed] Racing fuel ratios typically 1:30. Standard exhausts are difficult to improve on in terms of power and torque, but they are very large and ...
The 1990 season continued the trend of crashes as riders tried to cope with the harsh power output of the V4 two-strokes. [1] Honda put forth a proposition limiting the top class to 375cc and 3 cylinders, but that never caught on. [1] Still, with 500cc lap times becoming stagnant, it was clear that something needed to be done. [1]
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Keystone Resort is also home to two 18-hole championship golf courses, The Ranch and River Run. The Ranch course was designed by Robert Trent Jones Jr. and is situated next to a historic ranching homestead. In the winter, Keystone offers night skiing, a five-acre resurfaced ice skating lake, sleigh rides, and several fine-dining restaurants. [15]