25
Fault location
Fault
System
Observation
Cause
Cutting disc does not
start turning
Clutch
Engine runs
Damage to clutch
Engine does not start
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 system No compression when
pulled over
Cylinder head 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
Clutch
Contamination
adheres to clutch and
around parts
Ratchet spring contaminated and opened, have it cleaned
Warm start problems
Carburetor
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 systems may
simultaneously be
affected
Engine idling poor
Air filter contaminated, carburetor contaminated, muffler clogged,
exhaust duct in the cylinder clogged