2006-2009 Honda TRX680 (TRX 680 FA-FGA) Factory Service Manual, Page 231Get this manual
CYLINDERPISTON Do ncr damaytl plsfon ring by spreadIng the end roo fal
Spread each piston ri ng and remove it hy lihing up
cita point opposite the ga p
NINtH lISI" if W'I"
Clean car bo de posits from the isto ring rooves
blush: If WItscratch r!w groove
with ring that ill be discarded
CYLINDERPISTON INSPECTION
CYLINDER
Inspect the cylinder bo re tor scratch or wea rM easur the cylinder 10at three levels in I and axisTake the maximu readi ng dete rm ine the cy linde earSERVICE LIM IT: 102.05 mm (4 .018 ill )