8. CYLINDER/PISTON MXU 250R/300R PISTON RING INSTALLATION Install the piston rings onto the piston. Apply engine oil to each piston ring. · Be careful not to damage or break the piston and piston rings. · All rings should be installed with the Top markings facing up. · After installing the rings, they should Second rotate freely without sticking. Side Rail Oil Ring Side Rail Measure the connecting rod small end I.D. Service Limit (replace if over): 17.06 mm (0.6824 in) Measure the connecting rod to piston pin clearance. Service Limit (replace if over): 0.06 mm (0.0024 in) 8-8