Removing And Installing The Throttle Shaft - Stihl MS 650 Manual

The diaphragm material, inlet and
outlet valves are subjected to
continuous alternating stresses and
eventually shows signs of fatigue,
i.e. the diaphragm distorts and
swells and has to be replaced.
1
: Inspect the fuel strainer (1) for
contamination and damage. If
necessary, remove it from the
carburetor and clean or replace.
Reassemble in the reverse
sequence.
MS 650, MS 660
: Place the gasket (2) on the end
cover (1).
: Place the diaphragm (3) on the
end cover (1).
: Line up the diaphragm and
gasket so that they are centered
by the cast pegs (arrows).
– Fit the carburetor on the end
cover.
The pump diaphragm, gasket and
end cover are held in position by
pegs on the end cover.
– Fit screw and tighten it down
firmly – b 3.5
Reassemble all other parts in the
reverse sequence.
12.3.5 Removing and Installing
the Throttle Shaft
3 3
2 2
1 1
– Remove the carburetor –
b 12.2.1
: Take out the screw (1).
– Set the throttle shaft to the full
throttle position.
: Carefully pull the throttle shutter
out of the shaft.
1
: Unscrew the idle speed screw
(LA) (1).
: In idle position, lever (2) butts
against carburetor (arrow).
1
2
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