13
Fault
System
Observation
Cause
Engine not
starting or under
difficulties
Ignition system
Ignition spark existing
Fault in fuel supply or compression
system, mechanical defect
No ignition spark
Stop-switch operated, wiring fault or
short circuit, spark plug or connector
detective, ignition module faulty
Fuel supply
Fuel tank filled
Incorrect chock position, carburetor
defective, suction head dirty, fuel
supply line bent or interrupted
Compression
Inside of engine
Cylinder bottom gasket defective,
crankshaft seals damaged, cylinder or
piston rings defective
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 immediately
Fuel supply
Tank filled
Incorrect idling adjustment, suction
head or carburetor contaminated
Fuel tank vent defective, fuel supply
line interrupted, cable or stop-switch
faulty
Insufficient performance
Several system may
simultaneously be
affected
Engine idling
Air filter contaminated, carburetor
contaminated, muffler clogged,
exhaust duct in the cylinder clogged
FAULT LOCATION
