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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 Ignition system Ignition spark Malfunction in fuel supply system, com-
only with difculty pression system, mechanical malfunction.
No ignition spark
STOP switch in position, fault or short-circuit in
the wiring,
Spark plug cap or spark plug defective
Fuel supply Fuel tank is lled Combination switch in Choke position,
carburetor defective, suction head dirty, fuel
line bent or interrupted.
Compression Inside Cylinder base packing ring defective, radial
system shaft 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, suction head or
dies immediately carburetor dirty.
Tank venting defective, fuel line interrupted,
cable defective, Combination 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.