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7. CYLINDER/PISTON K-PIPE 50
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
Item Standard Limit (mm) Service Limit (mm)
I.D. 52.4
Warpage 0.05
Cylinder
Cylindricity 0.05
True roundness 0.05
Ring-to-groove top 0.12
clearance Second 0.12
top 0.10.25 0.5
Piston, Ring end gap Second 0.10.25 0.5
piston ring Oil side rail 0.10.25 0.5
Piston O.D. 55.5855.95 51.6
5mm from bottom of 5mm from bottom of skirt
Piston O.D. measuring position skirt
. Piston-to-piston pin clearance 0.0050.014 0.1
Piston pin hole I.D. 0.010.35 13.00
Piston pin O.D 12.99413.000 12.944
Connecting rod small end I.D. bore 13.01613.034 13.08
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
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