2006-2009 Honda TRX680 (TRX 680 FA-FGA) Factory Service Manual, Page 232Get this manual
CYLINDERPISTON Check the top of th cylinder for wa rpage wi th st raig ht edge and fee ler gauge across the stud
SERVICE LIMIT: 0.05 (0.002 in)
PISTON PIS TON RING
Inspect the pist on rings fo smooth ovement by ro tating th themThe rings should be able to move in hei rooves wi thou catching Push the ri ng unt il the outer su rface of the orston ring is nearly flush it the piston Clod easu re th ring.to -ring roove clea rance SERVICE LIM ITS:
0.095 mm 10.0037 in)