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Troubleshooting
Starting
Idling (low speed)
Idling (low speed) (continued)
Leaking inlet hose (rubber)
Loose carburettor mounting
Loose or faulty fuel pipe
Blocked fuel lter
Blocked fuel line
Tank ventilator blocked
The throttle valve shaft is inert
Throttle stay is binding
Defective throttle return spring
Bent valve axle stop
Faulty diffuser jet
Worn needle/needle tip
Worn lever arm in the control
system
Leaking diaphragm/cover plate
Does not idle
Too rich idling
8.1 Troubleshooting
The different faults which may occur on the chain saw are divided into four groups. Within each group
possible operating faults are listed to the left while the probable fault alternatives are listed to the right.
The most likely fault is listed rst, etc. See separate instruction for Autotune troubleshooting.
Worn needle/needle tip
Leaking diaphragm/cover plate
Worn lever arm in the control
system
Faulty diffuser jet
Blocked fuel lter
Blocked fuel line
Leaking inlet hose (rubber)
Loose carburettor mounting
Worn throttle valve axle
Loose throttle valve screw
Worn throttle valve
Leaking control system
(air or fuel)
The control system’s centre
knob is worn
Hole in diaphragm
Leaking diaphragm/
cover plate
Leaking crankcase
Blocked fuel line
Leaking control system
(air or fuel)
Leaking diaphragm/cover plate
Faulty diffuser jet
Leaking crankcase
Worn needle/needle tip
Leaking diaphragm/
cover plate
Difcult to start
The carburettor
leaks fuel
Floods when the
engine is not
running
Air lter blocked
Choke does not work
Worn choke axle
Worn choke valve
Blocked fuel lter
Blocked fuel line
Piston ring is stuck
Blocked impulse channel
Loose or faulty fuel pipe
Hole in diaphragm
Worn needle/needle tip
Control system sticking
Control system set too high
Leaking control system
(air or fuel)
The cover on the carburettor
pump side is loose
Worn needle/needle tip
Control system set too high
Control system sticking
Uneven idling
Too much fuel at
idle speed