STIHL 064, 066 14
2.6 Fuel System
Condition Cause Remedy
Carburetor floods; Inlet needle not sealing. Foreign Remove and clean or replace
engine stalls matter in valve seat or cone inlet needle, clean fuel
damaged. tank, pickup body and fuel
line if necessary
Inlet control lever Free off inlet control lever
sticking on spindle
Helical spring not located on Remove inlet control lever
nipple of inlet control lever and refit correctly
Perforated disc on diaphragm Fit new metering diaphragm
is deformed and presses constantly
against inlet control lever
Inlet control lever is too high Set inlet control lever flush with
(relative to design position) top of metering chamber face
Poor acceleration Idle jet "too lean" Back off low speed adjusting
screw slightly
(see carburetor adjustment)
Main jet "too lean" Back off high speed adjusting
screw slightly
(see carburetor adjustment)
Inlet control lever is too low Set inlet control lever flush with
(relative to design position) top of metering chamber face
Inlet needle sticking Remove inlet needle, clean
to valve seat and refit
Connecting bore to Clean bore
atmosphere blocked
Diaphragm gasket leaking Fit new diaphragm gasket
Metering diaphragm Fit new metering diaphragm
damaged or shrunk
Engine will not idle, Throttle valve opened too far Reset idle speed adjusting
idle speed too high by idle speed adjusting screw screw correctly
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