2002-2006 Yamaha SX Viper 700 Series Snowmobile Service Manual, Page 385Get this manual

2002-2006 Yamaha SX Viper 700 Series Snowmobile Service Manual, Page 385

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YAMAHA POWER VALVE SYSTEM (Y.P.V.S REMOVAL 1 Remove: Y.P.V.Svalve assembly
Do not use sharp instrumentAvoid damaging or scratching the surface2 Eliminate: Carbon deposit (from the cylinder) Use