MS 441
English
36
Adjusting Idle Speed
N
Carry out the standard setting.
N
Start and warm up the engine.
Engine stops while idling or chain runs
while engine is idling
N
Turn the idle speed screw (LA)
clockwise as far as stop or until the
chain begins to run – then turn the
screw back 1 1/2 turns.
WARNING
If the chain continues moving when the
engine is idling, have your saw checked
and repaired by your servicing dealer.
Erratic idling behavior, poor acceleration
(even though low speed screw is open
1/4 turn)
Idle setting is too lean
N
Turn the low speed screw (L)
counterclockwise, no further than
stop, until the engine runs and
accelerates smoothly.
It is usually necessary to change the
setting of the idle speed screw (LA) after
every correction to the low speed
screw (L).
Fine tuning for operation at high altitude
A slight correction of the setting may be
necessary if engine does not run
satisfactorily:
N
Carry out the standard setting.
N
Warm up the engine.
N
Turn high speed screw (H) slightly
clockwise (leaner) – no further than
stop.
NOTICE
After returning from high altitude, reset
the carburetor to the standard setting.
If the setting is too lean there is a risk of
engine damage due to insufficient
lubrication and overheating.
In some countries, the muffler is fitted
with a spark arresting screen.
N
If engine performance deteriorates,
check the spark arresting screen in
the muffler
N
Let the muffler cool down
N
Remove screw (1)
N
Pull out spark arresting screen (2)
N
Clean the dirty spark arresting
screen, replace if damaged or
heavily carbonized
N
Refit the spark arresting screen
N
Insert and tighten down the screw
219BA028 KN
Spark Arresting Screen in
Muffler