2005-2009 Honda TRX400EX/TRX400X Service Manual, Page 146Get this manual
CYLINDERPISTON Do nor damage rhe piS tOn rmgs by spreadmg lIIe ends roo far
Spread each piston ring and remove it by lifting up at point opposite the gap
Never use wire brush,( will scratch tile groov
Clean carbon deposits from the piston ring grooves wit ring that wi ll be discarded
INSPECTION
CYlINDE.R Inspect the cylinder wall for scratches or wearMeasure the cylinder 1.0at three levels in the and axisTake the maximum read ing to determine the cylinder wearSERVICE LIMIT: 85.10 mm (3.350 inCalculate the cylinder-to-piston clearanceRefer to page 9-6 for measurement of he piston .0 SERVICE LIMIT: 0.10 mm (0.004 in)