2006 Honda TRX680 Rincon Factory Service Manual, Page 232Get this manual

2006 Honda TRX680 Rincon Factory Service Manual, Page 232

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CYLINDERPISTON Check the top of the cylinder for warpage with straight edge and feeler gauge across the stud holesSERVICE LIMIT: 0.05 mm (0.002 in)

Insert the piston ring into the bottom