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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.
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.
Yamaha R5 (1972) The Yamaha R5 is a motorcycle made by Yamaha for production years 1970 (R5), 1971 (R5B) and 1972 (R5C). [when?] It was the first iteration of a new generation of horizontally split crankcase two strokes that also included the RD350 and culminated in the RD400. The engine platform also included the 250cc variants (DS7/RD250 ...
The Yamaha TZ 350 was a racing motorcycle produced by the Yamaha Motor Company from 1973 to 1981 for competition in the Grand Prix ... RD250, RD350, RD400, RZ250 ...
The frame dimensions of the street 350 are very similar to the Yamaha TZ 250 and TZ 350 series factory road race bikes, differing mainly in weight and front fork rake – the RD being ~27 degrees and the TZ being ~25 degrees. The frames appear similar, side by side, with the street frame adorned with many brackets for the street equipment.
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The TX750 is a two-cylinder standard motorcycle built by Yamaha.The bike was released in 1972. Significant reliability problems affected the engines in early bikes. Yamaha made several changes to solve the problems but the bike was withdrawn from most markets after 1974 and production stopped in the home market after 1975.
1972 marked the inaugural year for the AMA Motocross National Championship. Brad Lackey dominated the 500cc class ahead of Gary Jones and Wyman Priddy. [1] In 1972, after the season-ending 500cc race on September 2, American riders competing for the AMA national championship continued to accumulate points counting towards the national championship while they competed in the 1972 Trans-AMA ...