Winter Operation - Stihl MS 650 Instruction Manual

English / USA
The chain brake is designed to be
activated also by the inertia of the
front hand guard
if the forces are sufficiently high. The
hand guard is accelerated toward the
bar nose - even if your left hand is not
behind the hand guard, e.g. during a
felling cut. The chain brake will operate
only if it has been properly maintained
and the hand guard has not been
modified in any way.
Check operation of chain brake
Before starting work:
Run engine at idle speed, engage the
chain brake (push hand guard toward
bar nose). Accelerate up to full throttle
for no more than 3 seconds – the chain
must not rotate. The hand guard must be
free from dirt and move freely.
34
Chain brake maintenance
The chain brake is subject to normal
wear. It is necessary to have it serviced
and maintained regularly by trained
personnel, such as your STIHL servicing
dealer, at the following intervals:
Full-time professional
users: every 3
months
Semi-professional
users (in agriculture
and construction): every 6
months
Hobby and
occasional users: every 12
months

Winter Operation

1
2
At temperatures below +50 °F,
preheat carburetor as follows:
: Remove the carburetor box cover –
inside the carburetor box cover:
: Move the shutter from summer
position (1) to winter position (2).
Heated air is now drawn in from around
the cylinder and mixed with cold air –
this helps prevent carburetror icing.
: At temperatures above +70 °F:
Return shutter to summer position.
This is essential to avoid engine
running problems and overheating.
Machines with HD filter:
: Install a standard filter in place of
the HD-Filter.
: Refit the carburetor box cover and
tighten down the twist lock.
MS 650, MS 660