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The Yamaha TZ 250 was a commercially available racing motorcycle with a watercooled, two-stroke, 250 cc engine produced by the Japanese manufacturer Yamaha. The basis of the production-volume racer was the OW17 factory machine from Yamaha, which was used in the motorcycle world championship from 1973 to 1990, and with which Dieter Braun became ...
The Yamaha YZR 250 was a 250 cc Grand Prix racing motorcycle made by Yamaha from 1973 through 2003. [6] [7] [8] Notes
The Yamaha RD250 is a 250 cc (15 cu in) two-stroke motorcycle produced by Yamaha Motor Corporation between 1973 and 1987.. Four generations of RD (also known as the RZ250 in the Japanese and Australian markets) were produced: the air-cooled models from 1973 up to 1979, and from 1980 until 1987 the liquid cooled models; known as the RD250LC, RD250LC-II and RD250 YPVS.
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 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 DS7 is the forerunner of the Yamaha RD motorcycle series started in 1973. The major difference between the DS7 / R5350 and 1973 RD250 / 350 is the induction design. The DS7 and R5 are piston-ported, whereas the RDs used reed valve induction. Two Mikuni VM26 round slide carburetors serve the air-fuel charge.
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In 1973, in just his second season as an expert, Roberts won the AMA Grand National Championship. Despite his Yamaha dirt track motorcycle lacking the horsepower of the Harley-Davidson team, he won three races and consistently finished among the top ten, amassing a record 2,014 points in the 25-race series. [3]