Generic TR 125 - Fault Diagnosis; Cylinder Head

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12.2 Fault Diagnosis
Low compression pressure White smoke from exhaust pipe
Worn, burnt or broken piston Worn or damaged piston ring
Work or damaged cylinder and piston Worn or damaged cylinder and piston
Broken washer, air leakage between crankcase and gas
Higher compression pressure Noisy piston
Too much carbon deposited in the combustion chamber Damaged cylinder, piston and piston ring
Worn piston pin hole and piston pin
12.3 Cylinder Head
Removal
Remove cylinder block
Inspection
Inspect wear of cylinder inner wall.
If it is seriously worn, replace it.
Remove washer and location pin.
Cylinder
block
Gasket
Locating
pin
Piston pin
retainer