Adjusting Carburetor; Motor Management; Engine Stops While Idling; Chain Runs When Engine Is Idling - Stihl 9 Instruction Manual

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Exhaust emissions are controlled by the
design of the fundamental engine
parameters and components
(e.g. carburetion, ignition, timing and
valve or port timing) without the addition
of any major hardware.
•
Check the air filter and clean it if
necessary.
•
Warm up the engine.
•
Turn screws only very slightly and
carefully - even minor changes
have a noticeable effect on the
engine's running behavior.
It is usually necessary to change the
setting of the idle speed adjusting screw
/$ after every correction to the low
speed screw / .
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•
Turn the idle speed adjusting screw
/$ clockwise
until chain begins to run -
then back off the screw one quarter
of a turn.
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Turn the idle speed adjusting screw
/$ counterclockwise until chain
stops running -
then turn screw another quarter
turn in the same direction.
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Idle setting is too lean.
•
Turn the low speed adjusting screw
/ counterclockwise until engine
runs and accelerates smoothly.