Winter Operation - Stihl MS 661 Instruction Manual

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Winter Operation

Pre-heat carburettor at temperatures
below +10 °C
1
2
Remove the filter cover
N
in the filter cover, move the slide (1)
N
from summer position to winter
position (2)
Heated air is now drawn in from around
the cylinder and mixed with cold air – this
helps prevent carburettor icing.
At temperatures above +20 °C:
N
always return the slide to the
summer position –
NOTICE
otherwise risk of engine malfunction due
to overheating!
If engine trouble occurs, first return the
slide from winter to summer position.
26
At temperatures below -10 °C
Under extreme winter conditions
(temperatures below -10 °C, powdered
or drifting snow), it is recommended to
mount the cover plate (special
accessory) on the fan housing.
The partial covering of the slits in the fan
housing keeps out powdered or drifting
snow.
In case of erratic idling behaviour or poor
acceleration
Turn the low speed screw (L)
N
1/4 turn counterclockwise
Whenever the low speed screw (L) has
been adjusted, it is usually also
necessary to adjust the idle speed
screw (LA), see "Setting the
carburettor".
If the chain saw is extremely cold
N
(frost formation) – after starting,
bring the engine up to operating
temperature at increased idle speed
(disengage chain brake!)
Mounting the cover plate (special
accessory)
2
2
1
Insert cover plate (1) with both tabs
N
(arrows) and snap it onto the fan
housing
Screw in screws (2)
N
When the mounting kit is used, the slide
must be in the winter position.
If engine trouble occurs, first check
whether use of the cover plate is
necessary.
MS 661