| 1) No fuel flow: |
Check fuel cock position.
Fuel line clogged
Float valve clogged
|
| 2) No spark; spark
weak: |
Spark plug dirty, broken, or maladjusted
Spark plug cap or high tension wiring trouble
Spark plug cap not in good contact
Pickup coil trouble
CDI unit trouble
Ignition coil trouble
Manage to flywheel trouble
Wiring shorted or open
|
| 3) Compression low: |
Spark plug loose
Cylinder head not sufficient tightened down
No valve clearance
Cylinder, piston worn
Piston rings bad (worn, weak, broken, or sticking)
Piston ring/land clearnace excessive
Cylinder head gasket damaged
Cylinder head warped Valve spring broken or weak
Valve not seating properly (valve bent, worn, or carbon
accumulation on the seating surface)
|
| 4) Engine won’t
turn over: |
Valve seizure
Cylinder, piston seizure
Crankshaft seizure
Connecting rod small end seizure
Connecting rod big end seizure
Transmission gear or bearing seizure
Camshaft seizure
Clutch release maladjusted
Kick starter springs broken
|
