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