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Models with electric start
Cause
Action
Check battery connection.
Incorrect connection.
Rectify.
Check battery.
Too weak, or no charging.
Corrosion.
Check pole breaker,
recharge or replace the
battery.
Starter motor functions as normal. Same as for models with cord start. Same as for models with
cord start.
Contact the dealer if the engine still does not work after you have taken the above measures.
Low engine power
Problem
Cause
Action
The speed increases
slowly, drops, or the
engine stops when it is
given more throttle.
Ignition system.
Ignition setting fault.
Adjust the ignition
setting.
Fuel supply system Air in the fuel line, or fuel line
blocked.
Bleed or clear fuel
line.
Main nozzle incorrectly
aligned.
Adjust.
Needle valve or main nozzle
blocked.
Clean with
compressed air.
Fuel cock blocked.
Clean or replace.
Carbon deposits in
combustion chamber.
Clean.
As above.
Carbon deposits in muffler
and exhaust pipe.
Clean.
Air filter clogged.
Clean the air filter
unit.
Intake pipe leaking.
Repair or replace.
As above.
Low compression
Piston, cylinder or piston ring
worn.
Replace worn parts.
Air leak between cylinder and
cylinder head.
Replace cylinder
head gasket.
Valve clearance incorrect.
Adjust.
Leaking valves.
Repair.
The engine does not run smoothly
Problem
Cause
Action
The engine knocks.
Piston, cylinder or piston ring worn.
Replace worn parts.
Gudgeon pin or gudgeon pin hole worn.
Replace gudgeon pin or
piston.
Small-end bearing on connecting rod bolt
worn.
Replace connecting rod.
Main bearing worn.
Replace bearing.
Abnormal combustion. Engine overheating.
Troubleshoot.
Carbon deposits in combustion chamber.
Clean.
Wrong type of petrol or low grade of petrol.
Change to recommended
fuel.
No spark.
Water in float housing.
Clean.
Spark plug clearance incorrect.
Adjust.
As above.
Ignition setting fault.
Adjust.
Fault on induction coil etc.
Check and replace
damaged parts.
Summary of Contents for 725-017
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