Spark Plug - Stihl MS 150 TC Instruction Manual

Adjusting Idle Speed
Carry out the standard setting.
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Start the engine.
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Warm up the engine. Allow engine to
idle for 10 seconds before adjusting the
idle speed.
Engine stops while idling
Turn the idle speed screw (LA)
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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)
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counterclockwise until the chain
stops moving – allow engine to run
at idle speed for 10 seconds.
Turn the idle speed screw (LA)
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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
MS 150 TC
Turn the low speed screw (L)
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carefully counterclockwise, no
further than stop, until the engine
runs smoothly and accelerates well.
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 the engine does not run
satisfactorily:
Carry out the standard setting.
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Warm up the engine.
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Turn high speed screw (H) slightly
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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.

Spark Plug

If engine is down on power, difficult to
start or runs poorly at idling speed, first
check the spark plug.
Fit a new spark plug after approx. 100
operating hours or earlier if the
electrodes are badly eroded.
Wrong fuel mix (too much engine oil in
the gasoline), a dirty air filter and
unfavorable running conditions (mostly
at part throttle etc.) affect the condition
of the spark plug. These factors cause
deposits to form on the insulator nose
which may result in trouble in operation.
Removing the Spark Plug
Move the Master Control lever to 0
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or STOP.
Disengaging the Chain Brake
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English
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