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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 ...
In late 1975, Yamaha, having lost veterans to other teams, offered Hannah a contract. Hannah took the unsigned $1,000-a-month offer to Suzuki hoping that they would match it. [5] [8] Suzuki declined and Yamaha, in December 1975, announced that the virtually unknown Hannah would be joining the team for the 1976 season. [8] [11]
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]
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]
The Yamaha YZ250F is a motocross motorcycle first released in 2001 by Yamaha. It features a DOHC , four-stroke engine and initially had a steel frame and subframe in 2001–2002. In 2003 it received an aluminum subframe, which was replaced in the 2006 model with an all-aluminum frame.
The 1979 British Grand Prix would be remembered as one of the greatest races of the modern era with Roberts beating Sheene to the finish line by three-hundredths of a second. [ 3 ] After an eleven-year absence from world championship racing, Honda returned to competition with the exotic, four-stroke NR500 ridden by riders Mick Grant and ...
On February 11, 1979, the Islamic Revolution swept the country. From 1941 to 1979, Iran was ruled by King Mohammad Reza Pahlavi, the Shah. On February 11, 1979, the Islamic Revolution swept the ...
The 1979 IT175F model front fork trail was reduced to quicken the steering response and the CDI ignition system was upgraded from the earlier D/E model bikes.....this was the last year for LH side countershaft sprocket model of the IT175. Check out Yamaha-Enduros group for great data on all early 2-stroke Yamahas.