Stihl MS 441 C Instruction Manual - Page 48

Adjusting Idle Speed, Fine Tuning for Operation at High, Altitude, setting of the idle speed screw

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English / USA Adjusting Idle Speed Erratic idling behavior, poor acceleration (although L screw is open 1/4 turn) 219BA028 KN Engine stops while idling or chain runs while engine is idling : Check the standard setting. : Turn the idle speed screw (LA) slowly clockwise - as far as stop or until the chain begins to run - then turn the screw back 11/2 turn. If the chain continues moving when the engine is idling, have your saw checked and repaired by your servicing dealer. Idle setting is too lean: : Turn 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 power is not satisfactory when operating at high altitude: : Check the standard setting. : Warm up the engine. Turn the high speed screw (H) clockwise (leaner) - no further than stop. If the setting is too lean there is a risk of engine damage due to insufficient lubrication and overheating. MS 441 C 47

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47
MS 441 C
English / USA
Adjusting Idle Speed
Engine stops while idling
or chain runs while engine is idling
:
Check the standard setting.
:
Turn the idle speed screw (
LA
)
slowly clockwise – as far as stop or
until the chain begins to run – then
turn the screw back 1
1
/
2
turn.
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
(although L screw is open
1
/
4
turn)
Idle setting is too lean:
:
Turn 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 power is not
satisfactory when operating at high
altitude:
:
Check the standard setting.
:
Warm up the engine.
Turn the high speed screw (
H
) clockwise
(leaner) – no further than stop.
If the
setting is too lean
there is
a
risk of engine damage
due to
insufficient lubrication and
overheating.
219BA028 KN