2002 Yamaha YFM660 Grizzly factory service and repair manual, Page 172Get this manual

2002 Yamaha YFM660 Grizzly factory service and repair manual, Page 172

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VALVES AND VALVE SPRINGS Install
NOTE: After every lapping operation be sure to clean off all of the compound from the valve face and valve seat Apply

Mechanic's blueing dye (Dykem)