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40 – English
Worn needle valve/needle
Leaking control diaphragm/
cover plate
Control system sticking
Worn throttle lever
Faulty diffuser jet
Fuel filter blocked
Fuel line blocked
Leaking manifold
Loose carburettor mounting
Worn throttle valve shaft
Loose throttle valve screw
Worn throttle valve
Control system sticking
Leak in throttle system (air or
fuel)
Control diaphragm centre knob
is worn
Hole in diaphragm
Leaking control diaphragm/
cover plate
Crankcase leaking
Fuel line blocked
Control system set too high
Control system sticking
Control system (air or fuel)
Leaking control diaphragm/
cover plate
Faulty diffuser jet
Crankcase leaking
Control system set too high
Control system sticking
Control system damaged
Worn needle valve
Leaking control diaphragm/
cover plate
Control system incorrectly
assembled
Adjust L-screw
Air filter blocked
Choke not working correctly
Worn choke shaft
Worn choke plate
Fuel filter blocked
Fuel line blocked
Piston ring seized
Blocked impulse channel
Loose or faulty fuel pipe
Hole in diaphragm
Worn needle valve/needle
Control system sticking
Control system set too high
Leak in control system (air or
fuel)
Loose cover on carburettor
pump side
Worn needle valve
Control system set too high
Control system sticking
Difficult starting
Carburettor
leaking fuel
Flooding when
the engine is not
running
Faults that can develop on the chain saw are
divided into four groups as follows. In each cat-
egory, possible malfunctions are shown on the left,
with a list of possible faults on the right. The most
probable fault is given first and so on.
Idling (low rpm)
Will not idle
Idling too rich
Adjust L-screw
Leaking manifold (intermediate)
Loose carburettor mounting
Loose or faulty fuel pipe
Fuel filter blocked
Fuel line blocked
Fuel tank breather blocked
Throttle shaft and lever stiff
Throttle cable sticking
Defective throttle return spring
Bent throttle lever shaft stop
Faulty diffuser jet
Adjust L-screw
Worn needle valve/needle
Control system set too high
Worn throttle lever
Leaking control diaphragm/
cover plate
Control system sticking
Idles when L-screw
closed
Idling uneven
L-screw requires
constant adjustment
Too much fuel at idling
Trouble shooting schematic
TROUBLE SHOOTING
Starting
Idling (low rpm) (cont.)
Eng, p 40-82 96-09-13, 10.1440