1999-2004 Honda TRX400EX FourTrax Service Manual, Page 114Get this manual
CVLINDERPISTON Spread each piston ring and remove it by lifting up at point opposite the gapPISTON
CAUTION: Do not damage the piston ring by spreading the ends too far
Clean carbon deposits from the pistonCAUTION Clean carbon deposits from the ring grooves with ring that wi be discardedNever use wire brush; if wi scratch the groove
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 wear
SERVICE LIMIT 85.10 mm 13.350 in)
Calculate the cylinder-to-piston clearanceRefer to page 8-5 for measurement of the piston O.D