Stihl MS 191 T Instruction Manual page 36

Standard Setting
:
Shut off the engine.
:
Check the air filter and clean or
replace it as necessary.
: Check spark arresting screen in the
muffler and clean or replace it as
necessary.
: Turn the high speed screw (H)
counterclockwise (max.
far as stop.
:
Set the low speed screw (L) to one
full turn up.
MS 191 T
Adjusting Idle Speed
Engine stops while idling
:
Turn the idle speed screw (LA)
clockwise until chain begins to run –
then back it off one quarter of a turn.
Chain runs when engine is idling
Turn the idle speed screw (LA)
3
/ turn) as
4
counterclockwise until chain stops
running – then turn screw another
quarter turn in the same direction.
English / USA
Erratic idling behavior, poor
acceleration
Idle setting too lean:
:
Turn low speed screw (L)
counterclockwise until the engine
runs and accelerates smoothly
Adjustment for Operation at High
Altitudes
A slight correction of the setting may be
necessary if engine power is not
satisfactory when operating at high
altitude:
:
Check standard setting.
:
Warm up the engine.
:
Turn the high speed screw (H) and
the low speed screw (L) clockwise.
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