Stihl MS 290 Instruction Manual page 37

Carburetors with H = 1 and L = 1
Carefully screw both adjusting
N
screws down onto their seats
(clockwise).
Turn the high speed screw (H) one
N
full turn counterclockwise.
Turn the low speed screw (L) one
N
full turn counterclockwise.
Carburetors with H = 3/4 and L = 1/4
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.
MS 290, MS 310, MS 390
Adjusting Idle Speed
Carry out the standard setting.
N
Start and warm up the engine.
N
Engine stops while idling
Turn the idle speed screw (LA)
N
clockwise until the chain begins to
run – then back it off 1/4 turn.
Saw chain runs while engine is idling
Turn the idle speed screw (LA)
N
counterclockwise until the chain
stops moving – then turn it another
1/4 turn in the same direction.
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 on carburetors with L = 1/4,
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.
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.
English
35