FT 250
English
25
General Information
The carburetor comes from the factory
with a standard setting.
This setting provides an optimum fuel-air
mixture under most operating
conditions.
Preparations
N Shut off the engine.
N Mounting the circular saw blade.
N Check the air filter and clean or
replace if necessary.
N Check that the throttle cable is
properly adjusted – readjust if
necessary – see chapter on
"Adjusting the Throttle Cable".
Standard setting
– High speed screw (H) 3/4 turns
– Low speed screw (L) 3/4 turns
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 the standard setting.
N Start and warm up the engine.
Engine stops while idling
N Turn the idle speed screw (LA)
clockwise until the engine runs
smoothly – the saw blade must not
rotate.
Circular saw blade rotates when engine
is idling
N Turn the idle speed screw (LA)
counterclockwise until the saw
blade stops rotating and then turn
the screw another 1/2 to 1 full turn in
the same direction.
WARNING
If the saw blade continues to rotate
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.
Erratic idling behavior
Idle setting is too rich
N Turn the low speed screw (L)
clockwise, 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 engine does not run
satisfactorily:
Adjusting the Carburetor
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