2002-2006 Yamaha SX Viper 700 Series Snowmobile Service Manual, Page 169Get this manual

2002-2006 Yamaha SX Viper 700 Series Snowmobile Service Manual, Page 169

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OIL PUMP, CRANKCASE AND CRANKSHAFT 6 Install: Oil hose 1
Install so that the mark on the check valve faces the crankcase