7. CYLINDER/PISTON PEOPLE/PEOPLE S 250 SERVICE INFORMATION GENERAL INSTRUCTIONS · The cylinder and piston can be serviced with the engine installed in the frame. · When installing the cylinder, use a new cylinder gasket and make sure that the dowel pins are correctly installed. · After disassembly, clean the removed parts and dry them with compressed air before inspection. SPECIFICATIONS Standard (mm) Service Limit (mm) Item PEOPLE/PEOPLE S PEOPLE/PEOPLE S I.D. 72.70572.715 72.80 Warpage 0.01 0.05 Cylinder Cylindricity 0.01 0.05 True roundness 0.01 0.05 Ring-to-groove top 0.02 0.09 clearance Second 0.0150.050 0.09 top 0.10.25 0.50 Piston, Ring end gap Second 0.150.30 0.50 piston ring Oil side rail 0.250.7 1.0 Piston O.D. 72.6772.69 72.6 9mm from bottom of skirt 9mm from bottom of Piston O.D. measuring position skirt . Piston-to-cylinder clearance 0.0100.040 0.1 Piston pin hole I.D. 17.00217.008 17.04 Piston pin O.D 16.99417.000 16.96 Piston-to-piston pin clearance 0.0020.014 0.02 Connecting rod small end I.D. bore 17.01617.034 17.06 TROUBLESHOOTING · When hard starting or poor performance at low speed occurs, check the crankcase breather for white smoke. If white smoke is found, it means that the piston rings are worn, stuck or broken. Compression too low or uneven compression Excessive smoke from exhaust muffler · Worn or damaged cylinder and piston rings · Worn or damaged piston rings · Worn, stuck or broken piston rings · Worn or damaged cylinder and piston Compression too high Abnormal noisy piston · Excessive carbon build-up in combustion · Worn cylinder, piston and piston rings chamber or on piston head · Worn piston pin hole and piston pin · Incorrectly installed piston 7-2