Stihl MS 311 Manual

76 MS 311, MS 391
12.6.4 Air Valve
Air valve shaft stiff or air valve
cannot be closed or opened
properly:
The air valve matches the end
cover. If it is damaged, the complete
end cover must be replaced.
– Carburetor troubleshooting,
b 3.6
Position of throttle shutter/air
valve
The correct position of the air valve
can be checked visually as follows.
– Throttle shutter in idle position
– air valve fully closed.
– Throttle shutter in idle position /
full throttle position – air valve
closed / wide open.
– Throttle shutter in full throttle
position – air valve wide open.
– Throttle shutter in cold start
position l
– air valve fully closed.
– Throttle shutter in warm start
position n
– air valve open about 5°
The air valve must move freely in
both directions (open and closed)
and always return to the idle
position.
The air valve is fully closed in the
idle position.
Lever (1) must butt against lever (2)
and engage lever (3).
Lever (5) must engage lever (2) for
cold and warm starts
– the choke lever (5) returns to the
idle position when the throttle is
opened.
– Screw (4) must be tightened
down firmly.
The torsion springs (arrows) must
be preloaded and attached to the
levers.
4903RA192 TG
1
3
2
4
5
4903RA193 TG
12.6.5 Levers on Throttle Shaft
– Remove the carburetor, b 12.5
– Carburetor troubleshooting,
b 3.6
: Take out the screw (1).
– Relieve tension of the torsion
spring (2) and remove the lever
(3).
– Pull off the torsion spring (2) and
lever (4).
Installing
: Push the lever (1) onto the
throttle shaft as shown (arrow).
4903RA194 TG
1
4
2
3
4903RA195 TG
1

Stihl MS 311 Specifications

General

Oil tank capacity	0.348 L
Fuel tank capacity	0.6 L
Power source	Gasoline

Weight and Dimensions

Weight	6200 g