HT 250
English
27
Standard Setting
N
Turn high speed screw (H)
counterclockwise as far as stop (no
more than 3/4 turn).
N
Turn the low speed screw (L)
carefully clockwise as far as stop,
then turn it back 3/4 turn.
Adjusting Idle Speed
N
Carry out standard setting.
N
Start and warm up the engine for
about 3 minutes.
Engine stops while idling
N
Turn the idle speed screw (LA)
clockwise until the chain begins to
run – then back it off 1/4 turn.
Saw chain runs while engine is idling
N
Turn the idle speed screw (LA)
counterclockwise until the chain
stops moving – then turn it about
another 1/4 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
(despite correction to setting of LA
screw).
Idle setting is too lean
N
Turn the low speed screw (L)
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:
N
Carry out standard setting.
N
Warm up the engine.
N
Turn high speed screw (H) slightly
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.
255BA006 KN
H
L
255BA007 KN
LA
Summary of Contents for HT 250
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