18
125
-
160 cc
C
WORKSHOP MANUAL
Trouble shooting
Compression loss can be identified by measuring pressure directly.
If engine fails to start or idles unevenly, check for smoke in engine casing voids.
Presence of smoke means damaged, broken or worn piston rings.
Irregular full speed
Low compression
Air infiltrating through carburettor couplings
Poor fuel feed
Low compression
Incorrect valves clearance
Valve burnt or damaged
Incorrect timing
Weak valve spring
Poor valve seal
Pressure loss from head gasket
Head warped or cracked
Incorrect fitting of spark plug
High combustion pressure
Carbon deposits on piston or in combustion chamber
Blue smoke from exhaust
Damaged valve guide or valve stem
Damaged or worn seat ring
Anomalous noise
Damage or wear of camshaft assy components
Incorrect valves clearance
Burnt valve or damaged valve spring
Rocker arm or rocker arm shaft damaged
Chain stretched
Chain tensioner malfunction
CYLINDER HEAD, VALVES, CYLINDER, PISTON
