2006 Honda TRX680 Rincon Factory Service Manual, Page 216Get this manual

2006 Honda TRX680 Rincon Factory Service Manual, Page 216

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CYLINDER HEADVALVECAMSHAFT Contact area (too high or too low)Reface the valve seat
If the contact area is too high on the valve, the seat must be lowered using 32 flat cutterIf the contact area