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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 ...
This page was last edited on 17 December 2022, at 09:35 (UTC).; Text is available under the Creative Commons Attribution-ShareAlike 4.0 License; additional terms may apply.
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]
It appeared in production on the 1974 Yamaha YZ-250, a model which is still in production, making it Yamaha's longest continuous model and name. Yamaha continued racing throughout the 1960s and 1970s with increasing success in several formats. The decade of the 1970s was capped by the XT500 winning the first Paris-Dakar Rally in 1979. [13]
He was a full-time 500cc racer for the next two years, finishing fourth and third in the championship and winning the final round in both seasons. [ 1 ] During his first year in the 500cc class, Kocinski infamously told reporters that if a rider hadn't won the World Championship within 2 years of starting in the class, then they should give up ...
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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 Keystone Camera Company was an American manufacturer of consumer photographic equipment that began in 1919 in Boston. [1] Notable products were Movie cameras, 126 and 110 cameras with built-in electronic flash (the "Everflash" series). In the 1930s, the firm built low cost 16mm cameras that are still in use today.