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STIHL 029, 039
63
- Remove the sealing plate or plug
from of the metering chamber.
Caution:
The sealing plate or plug is
destroyed during removal. It should,
therefore, only be removed if a
replacement is available.
- The Walbro carburetor is equipped
with a fixed jet. To remove, use a
suitable tool to ease the retaining
ring out of its seat and then take
out the fixed jet and O-ring.
- Wash the carburetor body and all
serviceable parts in fresh white
spirit and blow clear with com-
pressed air, paying special atten-
tion to the bores and ports.
- To install the fixed jet, fit a new
O-ring in the bore for the fixed jet.
Press home the fixed jet (flat side
up) as far as stop and secure in
position with the retaining ring.
- When fitting the valve jet, make
sure it is exactly vertical in the
bore. Press it home until it is
flush with the bottom of the
metering chamber.
- Fit the inlet needle and the helical
spring in their respective bores.
Insert spindle in the inlet control
lever, engage clevis in annular
groove on the head of the inlet
needle and tighten down the round
head screw. Make sure that the
helical spring locates on the control
lever's nipple.
- Check easy action of the inlet
control lever.
Important:
The top of the inlet control
lever must be level with the bottom of
the metering chamber. If necessary,
use suitable pliers to carefully bend the
lever.
- After fitting new sealing plate or
plug, fill gap between carburetor
body and plate or plug with Loctite –
see 12.2.
Correct position of inlet
control lever
Removing the fixed jet
1 = Retaining ring
2 = Fixed jet
3 = O-ring
Top:
Sealing plate (Zama)
Bottom:
Sealing plug (Walbro)