163 09/02
NO ENGINE POWER
NO ENGINE POWER
NO ENGINE POWER
NO ENGINE POWER
NO ENGINE POWER
6
5
4
3
2
1
2
1
2
1
2
1
4
3
5
1
2
1
2
1
2
1
3
2
1
4
3
5
7
6
8
2
4
3
1
Clogged air cleaner.
Clogged fuel gallery.
Fuel gallery clogged between the tank and
the carburator.
Clogged exhaust pipe.
Defective automatic starter.
Broken vacuum piston diaphragm.
Defective CDI unit.
Defective A.C. generator.
Incorrect valve clearance adjustment.
Worn valve seat (the valve pin is too
projecting).
Incorrect valve running along
the seat.
Worn compression rings and cylinders.
Burnt cylinder head gasket.
Cylinder head failure.
Incorrect valve timing.
Clogged carburator jets.
Encrusted plug.
Incorrect heat rating.
High oil level.
Low oil level.
Oil change not carried out.
Clogged oil pipe.
Defective oil pump.
Insufficient coolant.
Defective thermostat.
Worn cylinder and compression ring.
Lean mixture.
Low fuel quality.
Excess of carbon.
Advance ignition timing.
Air in the cooling system.
Excess of carbon in the combustion
chamber.
Low fuel quality.
Clutch slippage.
Lean mixture.
Possible cause
Problem
Check/adjustment
Start the engine and speed up
slowly
Check the ignition timing
(using an adequate light)
Check valve clearance
Cylinder compression inspection
Check that the carburator is
not clogged.
Remove and check the spark
plug
Remove the oil dipstick and
check oil level and condition
Check the engine for
overheating
Speed up rapidly or let the
engine run at a high speed
The engine speed up
Correct timing
Correct
Normal compression
Not clogged
The plug is not encrusted
nor discoloured
Correct and not
contaminated
Correct lubrication of the
timig system
The engine does not
overheat
The engine does not
knock
The engine does not
speed up
Incorrect timing
Incorrect
Irregular compression
Clogged
Encrusted or discoloured
spark plug
Incorrect and
contaminated
Incorrect lubrication of
the timing system
The engine overheats
The engine knocks
Remove and check the
cylinder head oil plug
