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Trouble shooting
Malfunction System Observation Cause
Chain does not run Chain brake Engine runs Chain brake actuated.
Engine does not start or
only with difficulty
Ignition system Ignition spark Malfunction in fuel supply system, compression system, mechanical malfunction.
No ignition spark Switch on STOP, fault or short-circuit in the wiring, plug cap or spark plug defective.
Fuel supply Fuel tank is filled Choke in wrong position, carburetor defective, suction head dirty, fuel line bent or
interrupted.
Compression system Inside Faulty crankcase gasket, radial shaft packings defective, cylinder or piston rings
defective.
Outside Spark plug does not seal.
Mechanical malfunction Starter does not engage Spring in starter broken, broken parts inside the engine.
Warm start difficulties Carburetor Fuel tank is filled
Ignition spark
Wrong carburetor adjustment.
Engine starts, but dies
immediately
Fuel supply Fuel tank is filled Wrong idling adjustment, suction head or carburetor dirty. Tank venting defective,
fuel line interrupted, cable defective, STOP switch defective.
Insufficient power Several systems may be
involved simultaneously
Engine is idling Air filter dirty, wrong carburetor adjustment, muffler clogged, exhaust channel in cyl-
inder clogged.
No chain lubrication Oil tank/pump No oil on the chain Oil tank empty.
Oil guide groove dirty.