2006-2009 Honda TRX680 (TRX 680 FA-FGA) Factory Service Manual, Page 450Get this manual

2006-2009 Honda TRX680 (TRX 680 FA-FGA) Factory Service Manual, Page 450

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FRONT DRIVING MECHANISM
Improper tooth contact between ring gear and pinion gear Gear noise while coasting
Chipped or damaged gears

Abnormal noises when turning Worn or damage