2001 Yamaha YFM660 Raptor Factory Service Manual, Page 190Get this manual

2001 Yamaha YFM660 Raptor Factory Service Manual, Page 190

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CYLINDER HEAD COVER
Checking steps: Turn the crankshaft counterclockwise with wrenchAlign the "I" mark on the rotor with the stationary pointer on the crankcase coverWhen the "I" mark is aligned