12.3.3 Fixed Jet; 12.3.4 Pump Diaphragm - Stihl MS 650 Manual

3
1
2
: 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.
Note:
The upper face of the inlet control
lever must be flush with the top of
the carburetor body (+/- 0.1 mm).
– Install the metering diaphragm –
b 12.3.1
Reassemble all other parts in the
reverse sequence.
76

12.3.3 Fixed Jet

4
1
– Remove the metering diaphragm
– b 12.3.1
: Unscrew the fixed jet (1).
Take care not to damage the jet.
Reassemble in the reverse
sequence.

12.3.4 Pump Diaphragm

1
1
2 1
– Remove the carburetor –
b 12.2.1
: Take out the screws (1).
: Remove the end cover (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, install a new gasket.
MS 650, MS 660
1
2
1