25Fault locationFault System Observation CauseCutting disc does notstart turningClutch Engine runs Damage to clutchEngine does not startor with difficultyIgnition system Ignition spark O.K. Fault in fuel supply or compression system, mechanical defectNo ignition spark STOP-switch operated, wiring fault or short circuit, spark plug orconnector defective, ignition module faultyFuel supply Fuel tank filled Incorrect choke position, carburetor defective, fuel supply line bent orblocked, fuel dirtyCompression system No compression whenpulled overCylinder head gasket defective, crankshaft seals damaged, cylinder orpiston rings defective or improper sealing of spark plugMechanical fault Starter not engaging Broken starter spring, broken parts inside of the engineClutch Contaminationadheres to clutch andaround partsRatchet spring contaminated and opened, have it cleanedWarm start problems Carburetor Tank filled, ignitionspark existingCarburetor contaminated, have it cleanedEngine starts, but diesimmediatelyFuel supply Tank filled Incorrect idling adjustment, suction head or carburetor contaminatedFuel tank vent defective, fuel supply line interrupted, cable or STOP-switch faultyInsufficientperformanceSeveral systems maysimultaneously beaffectedEngine idling poor Air filter contaminated, carburetor contaminated, muffler clogged,exhaust duct in the cylinder clogged