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The TZR250R 3XV SPR actually uses a Triple-YPVS, which is a combination of the guillotine and "cotton reel" designs. Yamaha was actually the first company to produce consistent results with their YPVS in their race bikes. The 1977 OW35K was the first race bike to incorporate the power valve system and it won the Finnish GP in 1977.
Yamaha RD350 YPVS is a motorcycle that Yamaha made from 1983 to 1986. It was launched at the Cologne motorcycle show as "the nearest thing to a road going racer ever produced". [1] It had a parallel-twin two-stroke engine with identical bore and stroke of its predecessor, the Yamaha RD350LC.
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 Yamaha TZR125 is a two-stroke 125 cc (7.6 cu in) sports motorcycle made for the European and South East Asian markets which uses the YPVS.The TZR125 was produced from 1987 and spanned two generations until the late 1990s each with a number of variants and sub variants.
The Yamaha RZ350 is a two-stroke motorcycle produced by Japanese motorcycle manufacturer Yamaha between 1983 and 1996. Available in the US from 1983 to 1985, Canada until 1990 and Brazil until 1996. The RZ was the final evolution of the popular and well-known series of RD Yamaha motorcycles, and as such is also known as the RD350LC II or RD350 ...
The under-seat area is occupied by the upper cylinder exhaust chambers, the oil pump and one-way valves, the battery and the YPVS (Yamaha Power Valve System) servo motor. The battery is of the 'wet' lead acid type and a cut-out is provided in the right side panel to view the acid levels without having to dismantle half the bike!
The Yamaha TZR250 is a motorcycle manufactured and produced by the Japanese motorcycle manufacturer Yamaha between 1986 and 1995. [3] Yamaha produced the road going two-stroke motorcycle, loosely based on the TZ250 Yamaha racing bike. Parallel-twin, reverse cylinder and finally 90° V-twin variants were produced.
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]