Stihl 034 Series User Manual page 63

2
Remove the inlet control lever (1)
with spindle (2), spring (3) and
inlet needle (4).
If there is an annular indentation
on the sealing cone of the inlet
needle, it will be necessary to
replace the inlet needle because
it will no longer seal properly.
Use a suitable drift to press the
valve jet out of its seat, from
outside in the direction of the
venturi, and wash it in white spirit.
034, 036, 036 QS
1
4
3
2
A part-load fixed jet (2) is
installed in addition to the valve
jet (1) in machines from
X 35 047 484. It helps
prevent the mixture becoming
over-lean in the part-load range.
As the part-load fixed jet (2)
cannot be removed, blow it out
with compressed air.
Note:
Owing to differences in calibration,
the old versions of valve jets, high
speed and low speed adjusting
screws must not be installed in
carburetors with a part-load fixed jet
(see also parts list).
Remove the carburetor adjusting
screws.
1
Use a drift to press the center of
the sealing plate down until it
buckles and can be removed.
Caution:
The sealing plug is destroyed during
removal. Remove it only if a
replacement is available.
– Wash the carburetor body and all
serviceable parts in fresh white
spirit and blow clear with
compressed air, paying special
attention to the bores and ports.
– Fit the new sealing plate,
curvature facing up, in the bore
and use a large diameter drift to
carefully press it flat.
– When inserting the valve jet,
make sure it is exactly vertical in
the bore.
– Press the jet home until it is flush
with the metering chamber.
63