Stihl HT 250 Manual De Instrucciones página 29

Standard Setting
L
H
Turn the high speed screw (H)
N
clockwise as far as stop, then turn it
back 3/4 turn.
Turn the low speed screw (L)
N
clockwise as far as stop, then turn it
back 3/4 turn.
Adjusting Idle Speed
Carry out standard setting.
N
Start and warm up the engine for
N
about 3 minutes.
LA
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.
HT 250
Saw chain runs while engine is idling
Turn the idle speed screw (LA)
N
counterclockwise until the chain
stops moving and then turn the
screw about another 1/2 to 1 full
turn in the same direction.
WARNING
If the chain continues moving when the
engine is idling, have your machine
checked and repaired by your servicing
dealer.
Erratic idling behavior, poor acceleration
(even though setting of LA screw is
correct).
Idle setting is too lean
Turn the low speed screw (L)
N
counterclockwise, no further than
stop, 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 the engine does not run
satisfactorily:
Carry out 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
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