Fixed Jet; Pump Diaphragm - Stihl MS 290 Manual

4
2
Install in the reverse sequence.
: Fit the inlet needle (1).
: Fit spring (2) in bore.
: Insert spindle (3) in the inlet
control lever (4).
– Engage clevis in annular groove
on head of the inlet needle.
– Press the inlet control lever down
and secure it with the screw.
Make sure the helical spring locates
on the control lever's nipple.
– Check that inlet control lever
moves freely.
The upper face of the inlet control
lever must be flush with the top of
the carburetor body.
– Install the metering diaphragm,
b 11.3.1
Install all other parts in the reverse
sequence.
MS 290, MS 310, MS 390

11.3.3 Fixed Jet

1
3
1
– Remove the metering
diaphragm, b 11.3.1
: Use a suitable screwdriver to
unscrew the fixed jet (1).
Take care not to damage the fixed
jet.
Install in the reverse sequence.

11.3.4 Pump Diaphragm

1
– Remove the carburetor,
b 11.2.1
: Take out the screw (arrow).
: Remove the end cover (1).
1 2
: Carefully remove the gasket (1)
and pump diaphragm (2) from the
end cover or carburetor body.
: Carefully separate the diaphragm
and gasket.
– Inspect diaphragm for damage
and wear, fit a new gasket.
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