2002 Yamaha YFM660 Grizzly factory service and repair manual, Page 226Get this manual

2002 Yamaha YFM660 Grizzly factory service and repair manual, Page 226

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TRANSMISSION
CHECKING THE SECONDARY SHAFT AND DRIVEN SPROCKET 1.Check Gear teeth Blue discolorationpittingwear Replace
2.Check: Gear movement Unsmooth Repeat steps #1 or replace the defect