1983-1985 Original Honda ATC 200X Shop Manual, Page 77Get this manual
CYLINDERPISTON PISTON RING
Insert each piston ring into the cylinder and measure the ring end gap
SERVICE LIMITS: TOPSECOND: 0.5 mm (0.02 in)
Measure the piston diameter 10 mm (0.4 in) from the bottom of the skirt
SERVICE LIMIT: 64.90 mm (2.555 in) NOTE:
Measure the piston diameter perpendicular to the piston pin holeCalcualte the pistonto-cylinder clearance