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MALFUNCTION
SYMPTOM AND POSSIBLE CAUSES
Irregular running at
1) Full speed mixture jet clogged.
medium or high rpm.
2) Conical needle encrusted.
3) Throttle valve malfunctions.
4) Clogged filter.
Overflow and fuel level
1) Needle valve worn or damaged.
variations.
2) Float malfunctions.
3) Foreign matters stuck to needle valve.
4) Fuel level too high or too low.
5) Carburettor breather pipe clogged.
6) Needle valve spring broken.
7) Jet on fuel recovery pipe clogged.
8.1.3 RADIATOR
MALFUNCTION
SYMPTOM AND POSSIBLE CAUSES
Engine overheats.
10) Electrofan disconnected or faulty.
Engine does not reach the
1) Thermostat valve faulty, locked in total opening position.
right temperature.
2) Room temperature too cold.
8.1.4 ELECTRICAL SYSTEM
MALFUNCTION
SYMPTOM AND POSSIBLE CAUSES
Spark plug gets
1) Carburetion too rich.
immediately dirty with
2) Idling too high.
carbon deposits.
3) Unsuitable fuel.
4) Dirty air cleaner.
5) Spark plug too cold.
Spark plug gets dirty too
1) Piston segments worn.
soon.
2) Piston or cylinder worn.
Spark plug electrodes
1) Spark plug too hot.
overheated or burnt.
2) Engine overheats.
3) Spark plug loose.
4) Carburetion too poor.
Alternator does not charge.
1) Connection terminals interrupted, in short circuit or loose.
2) Alternator coils in short circuit, earthed or interrupted.
3) Regulator/rectifier in short circuit or faulty.
Alternator charges, but
1) Terminals tend to shortcircuit, interrupt or move away from one another.
charging rate is below
2) Alternator stator coils earthed or interrupted.
normal.
3) Faulty regulator/rectifier.
4) Faulty battery.
Alternator charges too
1) Short circuit inside the battery.
much.
2) Regulator/rectifier damaged or faulty.
3) Unstable mass of regulator/rectifier.
8.1.5 BATTERY
MALFUNCTION
Battery discharges too
quickly
Battery polarity inverted.
Battery discharges too
quickly.
1) Insufficient coolant.
2) Radiator fin unit clogged by dirt or foreign matters.
3) Thermostat valve faulty, locked in closing position.
4) Coolant passages clogged.
5) Air in cooling circuit.
6) Coolant pump faulty.
7) Unsuitable coolant.
8) Faulty thermal switch.
9) Electric terminals on thermal switch inverted.
SYMPTOM AND POSSIBLE CAUSES
1) Recharging system faulty.
2) Battery elements have lost much active material following to excessive charge.
3) Presence of short circuits inside the battery due to the excessive accumulation of se-
diments due to unsuitable electrolyte.
4) Old battery.
1) Battery wrongly connected to system.
1) Dirt on top and sides of battery box.
2) Old battery.
REPAIRS
REMEDY
Check and clean.
Check and clean.
Check throttle valve opera-
tion.
Check and clean.
Change.
Clean and adjust.
Clean.
Adjust float height.
Clean.
Change.
Check and clean.
REMEDY
Add coolant.
Clean.
Change.
Clean.
Bleed.
Change.
Change coolant.
Change.
Connect correctly.
Connect or change.
Change.
Install protection screen on ra-
diator.
REMEDY
Adjust carburettor.
Adjust carburettor.
Change fuel.
Clean.
Change with "hot" type spark
plug.
Change.
Change.
Change with "cold" type spark
plug.
Adjust.
Tighten.
Adjust carburettor.
Repair, change or tighten.
Change.
Change.
Repair or tighten.
Change.
Change.
Change.
Repair or change.
Change.
Change.
REMEDY
Check alternator, regulator/recti-
fier, circuit connections and per-
form the operations necessary
to restore correct recharge.
Change battery and repair re-
charing system.
Change battery
Change battery.
Change battery and connect it
correctly
Clean.
Change battery.
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