Stihl MS 290 STIHL FARM BOSS Product Instruction Manual - Page 43

Standard setting, Adjusting idle speed

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English / USA H 3/4 L 1/4 HL LA Adjusting idle speed Engine stops while idling : Turn the idle speed adjusting screw (LA) clockwise until chain begins to run - then back off the screw one quarter of a turn. Chain runs when engine is idling : Turn the idle speed adjusting screw (LA) counterclockwise until chain stops running - then turn screw another quarter turn in the same direction. H 3/4 L 1/4 HL LA Standard setting : Shut off the engine. : Check the air filter and replace if necessary. : Check the spark arresting screen and clean or replace as necessary. : Turn the high speed adjusting screw (H) counterclockwise up to the stop, i.e. 3/4 turn from max. lean setting. : Turn the low speed adjusting screw (L) clockwise up to the stop - then back off the screw one quarter of a 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 Idle setting is too lean. : Turn the low speed adjusting screw (L) counterclockwise until engine runs and accelerates smoothly. 139BA013 KN 139BA013 KN 42 MS 290, MS 310, MS 390

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42
English / USA
MS 290, MS 310, MS 390
Standard setting
:
Shut off the engine.
:
Check the air filter and replace if
necessary.
:
Check the spark arresting screen
and clean or replace as necessary.
:
Turn the high speed adjusting screw
(H)
counterclockwise up to the stop,
i.e.
3
/
4
turn from max. lean setting.
:
Turn the low speed adjusting screw
(L)
clockwise up to the stop – then
back off the screw one quarter of a
turn.
Adjusting idle speed
Engine stops while idling
:
Turn the idle speed adjusting screw
(LA)
clockwise until chain begins to
run – then back off the screw one
quarter of a turn.
Chain runs when engine is idling
:
Turn the idle speed adjusting screw
(LA)
counterclockwise until chain
stops running – then turn screw
another quarter turn in the same
direction.
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
Idle setting is too lean.
:
Turn the low speed adjusting screw
(L)
counterclockwise until engine
runs and accelerates smoothly.
H
L
LA
139BA013 KN
4
L
H
3
1
/
4
/
H
L
LA
139BA013 KN
4
L
H
3
1
/
4
/