78 MS 171, MS 181, MS 211
: Carefully separate the pump
diaphragm (1) and gasket (2).
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.
– Check the pump diaphragm for
signs of damage and wear. Install
a new gasket.
– Check fuel strainer for
contamination and damage.
Clean or replace if necessary,
b 16
: Use a needle to remove the fuel
strainer (1) from the carburetor
body.
– Install in the reverse sequence.
533RA319 TG
2
1
533RA320 TG
1
: Fit the gasket (1) so that it
matches the contour of the end
cover (arrows) and is held in
position by the pegs (2).
: Coat the diaphragm (1) with fuel
and fit it so that it matches the
contour of the gasket (arrows)
and is held in position by the pegs
(2).
– Line up the end cover (1) so that
the shoulder (arrow) points
towards the throttle shutter.
533RA321 TG
1
2
2
533RA322 TG
1
2
2
533RA323 TG
1
: Place the end cover (1) against
the carburetor body from below
so that the gasket and pump
diaphragm remain in position on
the end cover.
– Align the end cover (1) so that its
pegs engage the holes in the
carburetor body.
– Check that diaphragm and
gasket are properly seated.
: Insert screw and tighten it down
firmly.
– Reassemble all other parts in the
reverse sequence.
533RA324 TG
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