YPVS-Yamaha Power Valve System
YPVS-Yamaha Power Valve System | Yamaha RD125 | Yamaha RD250 | yamaha RD350 Yamaha RD500 | Yamaha 2-Stroke | Yamaha | way2speed.com . [Join us on Facebook, Youtube, Twitter and Pinterest]
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. The Kadenacy effect was harnessed and controlled to a point that gave Yamaha great advantage over all the other manufacturers throughout the late ’70s and into the mid ’80s. The first street bikes with YPVS were the RZ/RD350 YPVS (LC2-onwards), and RZ/RD500 GP Replica in 1983-84.
http://www.2strokeworld.com/forum/index.php?topic=18117.0
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Source: http://www.way2speed.com/2013/12/ypvs-yamaha-power-valve-system.html
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