12.3.2 Inlet Needle - Stihl MS 650 Manual

If the gasket and diaphragm are
stuck to the carburetor, remove
them very carefully.
The diaphragm material is
subjected to continuous alternating
stresses and eventually shows
signs of fatigue, i.e. the diaphragm
distorts and swells and has to be
replaced.
Reassemble in the reverse
sequence.
1 1
: Place the gasket on the
carburetor body so that the tab
(arrow) points towards the
adjusting screws. The cast pegs
(1) hold the gasket in position.
MS 650, MS 660
1
: Fit the metering diaphragm (1) on
the carburetor body so that the
perforated plate faces the inlet
control lever and the tab (arrow)
points towards the adjusting
screws.
The gasket and metering
diaphragm are held in position by
integrally cast pegs.
– Fit the end cover.
– Insert the screws and tighten
them down firmly – b 3.5
Reassemble all other parts in the
reverse sequence.

12.3.2 Inlet Needle

1
– Remove the metering diaphragm
– b 12.3.1
: Take out the screw (1).
– Remove the inlet control lever
with spindle.
There is a small spring under the
inlet control lever which may pop
out during disassembly.
– Take out the inlet needle.
: If there is an annular indentation
(arrow) on the sealing cone of the
inlet needle, fit a new inlet
needle.
Reassemble in the reverse
sequence.
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