Troubleshooting Chart - Stihl 009 User Manual

STIHL 009, 010, 011
8.2

Troubleshooting Chart

Fault
Carburetor floods –
engine stalls
Engine does not respond properly
to throttle
Engine will not idle
Cause
Inlet valve not sealing.
Foreign matter in valve seat
or cone damaged
Helical spring not located on
dimple of inlet control lever
Perforated disc on diaphragm
is deformed and presses
constantly against inlet control
lever
Inlet control lever too high
(relative to design position)
Idle jet "too lean"
Inlet control lever too low (relative
to design position)
Vent bore to atmosphere blocked
Diaphragm gasket leaking
Metering diaphragm damaged
Throttle valve opened too far
by idle speed adjustment screw
Remedy
Remove and clean or
replace inlet needle
Remove inlet control lever and
refit correctly
Fit new metering diaphragm
Set inlet control lever flush with
top edge of plate
Back off low-speed adjustment
screw slightly (see Carburetor
Adjustment)
Set inlet control lever flush with
top edge of plate
Clean bore
Fit new diaphragm gasket
Fit new metering diaphragm
Reset idle speed adjustment
screw
45