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Fault location
Fault System Observation Cause
Engine not starting
or with difficulty
Ignition system Ignition spark O.K.
Fault in fuel supply or compression
system, mechanical defect
No ignition spark
STOP-switch operated, wiring fault
or short circuit, spark plug or
connector defective, ignition module
faulty
Fuel supply Fuel tank filled
Incorrect choke position, carburetor
defective, fuel supply line bent or
blocked, fuel dirty.
Compression
No compression
when pulled over
Cylinder bottom gasket defective,
crankshaft seals damaged, cylinder
or piston rings defective or improper
sealing of spark plug
Mechanical fault Starter not engaging
Broken starter spring, broken parts
inside of the engine
Warm start
problems
Tank filled ignition
spark existing
Carburetor contaminated, have it
cleaned
Engine starts but
dies
Fuel supply Tank filled Incorrect idling adjustment,
carburetor contaminated
Fuel tank vent defective, fuel supply
line interrupted, cable or
STOP-switch faulty
Insufficient
performance
Several systems
may simultaneously
be affected
Engine idling poor Air filter contaminated, carburetor
contaminated, muffler clogged,
exhaust duct in the cylinder clogged