2002-2006 Yamaha SX Viper 700 Series Snowmobile Service Manual, Page 408Get this manual

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YAMAHA POWER VALVE SYSTEM (Y.P.V.S
3 Inspect: Servomotor Inspection steps: Connect the Y.P.V.Sadjustment coupler to the Y.P.V.Scheck coupler and apply battery voltage (12 V) to the Y.P.V.Sadjust

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