7. CYLINDER/PISTON STRYKER 125/150 SERVICE INFORMATION GENERAL INSTRUCTIONS · The cylinder and piston can be serviced with the engine installed in the frame. · After disassembly, clean the removed parts and dry them with compressed air before inspection. SPECIFICATIONS Unit: mm Standard Service Limit Item 125cc 150cc 125cc 150cc I.D. 56.556.51 6262.01 56.7 62.2 Warpage Cylinder Cylindricity 0.01 0.05 True roundness 0.01 0.05 Ring-to-groove Top 0.450.7 0.9 clearance Second 0.81.05 1.2 Top 0.10.3 0.5 Piston/ Ring end gap Second 0.10.3 0.5 piston ring Oil side rail 0.30.9 1.1 . Piston O.D. 56.4556.48 61.9761.99 56.30 61.81 Piston O.D. measuring position 5mm from bottom of skirt Piston-to-cylinder clearance 0.0050.065 0.1 Piston pin hole I.D. 15.00215.008 15.06 Piston pin O.D 14.99415 14.90 Piston-to-piston pin clearance 0.0010.007 0.01 Connecting rod small end I.D. 15.0115.028 15.09 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 Excessive smoke from exhaust muffler · Worn, stuck or broken piston rings · Worn or damaged piston rings · Worn or damaged cylinder or piston · Worn or damaged cylinder or piston Compression too high Abnormal noisy piston · Excessive carbon build-up in combustion · Worn cylinder, piston or piston rings chamber or on piston head · Worn piston pin hole or piston pin 7-2