ENGINE
Trouble
Engine don't start or starts
with difficulty
Engine cuts out easily
Engine noisy
INCONVENIENTI E RIMEDI
TROUBLES AND REMEDIES
INCONVENIENTES ET REMEDES
STOERUNGEN UND BEHEBUNGEN
INCONVENIENTES Y REMEDIOS
Cause
Inadequate compression
1. Piston seizure
2. Con-rod small or big end seized
3. Piston rings worn
4. Cylinder worn
5. Low torque cylinder head nuts
6. Head gasket blowing
7. Spark plug loose
8. Incorrect valve play
9. Valve springs weak or seized
10. Valves seized
11. Incorrect decompressor adjustment
No or weak spark
1. Spark plug faulty
2. Spark plug dirty or wet
3. Spark plug gap too large
4. Ignition coil faulty
5. H.T. leads damaged or short circuiting
6. Electronic device faulty
7. R.H. switch faulty
Fuel not reaching carburettor
1. Fuel tank cap breather blocked
2. Fuel cock blocked
3. Fuel feed hose blocked
4. Carburettor fuel filter dirty
5. Worn out float valve or worn out floats
6. Rocker blocking float valve
Carburettor flooding
1. High fuel level in float bowls
2. Worn out float valve or worn out floats in open position
1. Spark plug dirty
2. Electronic control unit faulty
3. Carburettor jets blocked
4. Idling low
Piston noise
1. Excessive play between cylinder liner and piston
2. Piston rings or piston rings seats worn
3. Excessive carbon layers inside the combustion chamber,
or on the piston top
4. Worn rocker arm
5. Excessive valve play
6. Valve springs weak or seized
7. Cam chain worn
8. Incorrect timing chain adjustment
Crankshaft noise
1. Main bearings worn
2. High radial and axial play at con-rod big end
3. Crankshaft gear damaged
4. Crankshaft nut loose
Tighten
C.6
Remedy
Replace
Replace
Replace
Replace
Tighten
Replace
Tighten
Adjust
Replace
Replace
Adjust
Replace
Clean or dry
Adjust
Replace
Check
Replace
Replace
Clean
Clean
Clean
Clean
Replace
Free
Adjust
Replace or free
Clean
Replace
Clean
Adjust
Replace
Replace
Clean
Replace
Adjust
Replace
Replace
Adjust
Replace
Replace
Replace
Part. N. 8000 A5911 (03-2006)
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