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Determine the required standard
N
setting as follows: Turn the low
speed screw (L) carefully clockwise
as far as stop, then turn it
counterclockwise.
Is range of adjustment more than 1 turn?
Continue with "Standard setting A"
N
Is range of adjustment less than 1 turn?
Continue with "Standard setting B"
N
Standard setting A
Turn high speed screw (H)
N
counterclockwise as far as stop (no
more than 3/4 turn).
Turn the low speed screw (L)
N
carefully clockwise until it is against
its seat, then turn it back 1 full turn
38
Standard setting B
Turn high speed screw (H)
N
counterclockwise as far as stop (no
more than 3/4 turn).
Turn the low speed screw (L)
N
carefully clockwise as far as stop,
then turn it back 1/4 turn.
Adjusting Idle Speed
Carry out the standard setting.
N
Starting the Engine
N
Warm up engine before adjusting idle
speed. Run the engine at idle speed for
10 seconds.
Engine stops while idling
Turn the idle speed screw (LA)
N
clockwise until the chain begins to
run – then back it off 4 turns.
Saw chain runs while engine is idling
Turn the idle speed screw (LA)
N
counterclockwise until the chain
stops moving – allow engine to run
at idle speed for 10 seconds.
Turn the idle speed screw (LA)
N
clockwise until the chain begins to
run – then back it off 4 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 standard setting of low
speed screw is correct)
Idle setting is too lean
Turn the low speed screw (L)
N
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:
Carry out the standard setting.
N
Warm up the engine.
N
Turn high speed screw (H) slightly
N
clockwise (leaner) – no further than
stop.
MS 150 C
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