Online version - not for reprint
74 MS 270, MS 280
If the gasket and diaphragm are
stuck to the carburetor, remove
them very carefully.
Carefully separate the diaphragm
and gasket.
The diaphragm, inlet and outlet
valves are subjected to continuous
alternating stresses and the
material eventually shows signs of
fatigue, i.e. the diaphragm distorts
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and swells and has to be replaced.
Install in the reverse sequence.
Place the gasket on the
carburetor body so that the tab
(arrow) points towards the
adjusting screws.
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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
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1
diaphragm are held in position by
integrally cast pegs.
– Fit the end cover.
– Insert the screws and tighten
them down firmly – see 3.5.
Reassemble all other parts in the
reverse sequence.
– Remove the metering diaphragm
– see 12.3.1.
Take out the screw (arrow).
– Remove the inlet control lever
with spindle.
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Note: 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
on the sealing cone of the inlet
needle, it will be necessary to
replace the inlet needle because
it will no longer seal properly.
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12.3.2 Inlet Needle
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