83TS 410, TS 420
– Check that the diaphragm and
gasket are correctly seated.
: Insert and tighten down the
screw.
– Reassemble remaining parts in
reverse order.
12.3.5 Air valve
If actuation of the air flap shaft is stiff
and/or the air flap cannot be opened
or closed properly:
As a rule, the air valve must begin to
open when the throttle shutter is
approx. ¼ open.
– Remove the carburetor, b 12.2.
– Troubleshooting on the
carburetor, b 4.5.
Check position of throttle shutter
(throttle trigger position)/ air
valve
The correct position of the air valve
can be visually checked as follows:
– Throttle shutter at idle speed – air
valve is completely closed
– Throttle shutter between idle
speed and full throttle – air valve
is between closed and open
wide
1)
370RA354 TG
– Throttle shutter in full throttle
position – air valve is open wide
1)
– Throttle shutter in cold start
position l
– air valve is completely closed
– Throttle shutter in hot start
position k
– air valve is open approx. 10°
1)
The air valve must be able to
move in both directions (open
and closed) and must always
return to its starting position.
Rod (1) must be attached to
lever (2) and the oblong hole
(arrow) in the lever (3).
The rod must be secured to both
levers with an E-clip.
Torsion springs (arrows) must be
pre-tensioned and attached to the
levers.
370RA355 TG
2
1
3
370RA356 TG
Removal and installation
: Remove the screw (arrow).
: Turn the air valve shaft (1) and
pull out the air valve (2).
: Remove the E-clip (arrow).
– Unhook the rod (1).
370RA357 TG370RA358 TG
1 2
370RA359 TG
1
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