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Troubleshooting
Malfunction System Observation Cause
Chain does not run Chain brake Engine runs Chain brake actuated.
Engine does not start or Ignition system Ignition spark Malfunction in fuel supply system, com-
only with difculty pression 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 lled Choke in wrong position, carburetor defective,
suction head dirty, fuel line bent or interrupted.
Compression Inside
Faulty crankcase gasket, radial shaft
system packings defective, cylinder or piston rings
defective
Outside Spark plug does not seal.
Mechanical Starter does not engage Spring in starter broken, broken parts
malfunction inside the engine.
Warm start difculties Carburetor Fuel tank is lled Wrong carburetor adjustment.
Ignition spark
Engine starts, but Fuel supply Fuel tank is lled Wrong idling adjustment, fuel lter or
dies immediately carburetor dirty.
Tank venting defective, fuel
line interrupted, cable defective, STOP switch
defective.
Insufcient power Several systems Engine is idling Air lter dirty, wrong carburetor adjustment,
may be involved mufer clogged,exhaust channel in cylinder
simultaneously clogged
, spark arrester screen clogged.
No chain lubrication Oil tank/pump No oil on the chain Oil tank empty.
Oil guide groove dirty.
Oil-pump adjusting screw incorrectly adjusted.