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1
Metering diaphragm
– Take the metering diaphragm off
the flange.
Note:
The diaphragm is exposed to
continuous alternating stresses and
the material eventually shows signs
of fatigue. The diaphragm distorts
and swells and has to be replaced.
Fit metering diaphragm (1) with
the perforated plate facing the
inlet control (2). The diaphragm is
located by the pegs on the flange.
1
Inlet needle
– Remove the metering
diaphragm.
Take out the screw (1).
36
– Remove inlet control level with
spindle.
– Pull out the inlet needle.
Note:
2
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.
1
Fit the inlet needle.
Fit helical spring (1) in the hole.
Insert spindle (2) in the inlet
control lever (3).
– Engage clevis of inlet control
lever in annular groove on the
head of the inlet needle.
– Press down the inlet control lever
and secure it with the screw.
Note:
Make sure that the helical spring
locates on the control lever's nipple
– Check that inlet control lever
moves freely.
Important:
Upper edge of inlet control lever
must be flush with bottom of
metering chamber.
Removing rotary valve
Loosen screws (arrows) and pull
rotary valve out of carburetor.
Note:
Installed position: Stop for rotary
valve lever at air filter side.
– Tighten the screws securely.
2
3
1
Series 4141 Powerhead
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