2006 Honda TRX680 Rincon Factory Service Manual, Page 231Get this manual
CYLINDERPISTON Do not damage the Spread each piston ring and remove it by lifting up piston ring by at point opposite the gapspreading the end too far
Never use wire Clean carbon deposits from the piston ring grooves brush; it will scratch with ring that will be discardedthe groove
CYLINDERPISTON INSPECTION
CYLINDER
Inspect the cylinder bore for scratch or wearMeasure the cylinder I.Dat three levels in an and axisTake the maximum reading to determine the cylinder wearSERVICE LIMIT: 102.05 mm (4.018 in) Calculate the cylinder-to-piston clearanceRefer to page 10-6 for measurement of the piston O.DSERVICE LIMIT: 0.19 mm (0.007 in)