Stihl 029, 039 Service Manual page 62

STIHL 029, 039
Top:
Round head screw on control lever
spindle (Zama)
Bottom:
1 = Round head screw
2 = Inlet control lever
3 = Spindle
4 = Helical spring
5 = Inlet needle
- The inlet needle valve is located in
a recess in the metering dia-
phragm chamber. Remove the
round head screw or collar screw.
- Remove the inlet control lever
with spindle, helical spring and
inlet needle.
Top:
Damaged inlet needle
Bottom:
Pressing out valve jet (Zama)
Note: If there is an annular inden-
tation on the sealing cone of the inlet
needle, it will be necessary to replace
the inlet needle because it will no
longer seal properly. This is indicated
by constant flooding of the carburetor
even though the needle is clean.
- Use a 5 mm (approx. 3/16") dia.
drift to press the valve jet out of its
seat in the direction of the venturi
and wash it in white spirit
Top:
Pressing out valve jet (Walbro)
Bottom:
Carburetor adjusting screws
Note: On Walbro carburetor, use a
4 mm (approx. 5/32") dia. drift to
press the valve jet out of its seat.
- Remove the carburetor adjusting
screws.
.
62