80
MS 171, MS 181, MS 211
– Check the air valve shaft (1) and
torsion spring (2) and replace if
necessary.
– Note installed position (arrow) of
torsion spring.
:
Push the air valve shaft (1) into
the valve body (arrow).
– Apply thin coating of oil to air
valve shaft and guides,
b
16
:
Position leg of torsion spring
against web (arrow) on valve
body.
533RA330 TG
1
2
1
533RA331 TG
533RA332 TG
:
Fit the E-clip (1).
:
Turn the air valve shaft (1)
counterclockwise until the its flat
side (arrow) points upwards – air
valve shaft is now preloaded.
– Hold the air valve shaft in the
preloaded position.
:
Slide the air valve (1), with the
hole (2) on the left and the
marking visible, into the slot in the
shaft.
533RA333 TG
1
1
533RA334 TG
533RA335 TG
2
1
– Coat the screw with thread-
locking adhesive,
b
16
:
Insert new screw (1) and tighten
moderately.
– Close the air valve (2) and center
it in the valve body’s bore.
– Tighten down the screw firmly.
– Check valve’s freedom of
movement.
– Reassemble all other parts in the
reverse sequence.
14.4.7 Choke Shaft / Choke
Shutter
Choke shaft stiff or choke shutter
cannot be closed or opened
properly:
– Remove the carburetor,
b
14.3
– Carburetor troubleshooting,
533RA336 TG
1
2
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