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