2. Close the throttle slowly and adjust
the low speed setting by rotating the
idle needle valve (89) clockwise to
lean the mixture and counterclockwise
to richen the mixture.
Note: The fuel mixture is too rich if
when openning the throttle rapidly the
engine emits white smoke and
“stutters” or “stumbles.” Correct this
by rotating the idle needle valve
clockwise
1
/
4
to
1
/
2
turn at a time
until the engine transitions smoothly
without hesitation upon opening the
throttle rapidly.
The fuel mixture may be too lean if the
engine stops at the lowest idle position,
or when the throttle is rapidly opened
from idle. Attempt to correct this by
rotating the idle needle valve counter-
clockwise
1
/
4
to
1
/
2
turn at a time until
the engine transitions smoothly without
hesitation upon opening the throttle
rapidly. If the situation is not rectified
by counterclockwise rotations of the
idle needle valve, turn the idle
needle valve clockwise in
1
/
4
to
1
/
2
turn increments.
3. After obtaining the proper idle
setting, the low rpm setting may be
made through the positioning of the
throttle adjustment screw, if applicable.
If not, adjust the idle setting via the
throttle trim of your transmitter.
Carburetor
Adjustments for Air
Bleed Carburetors
Note: The Saito FA-30S(H) and
FA-30SGK use an air bleed carburetor.
1. Start the engine and let it warm up
prior to attempting any adjustments.
2. Close the throttle slowly and adjust
the airscrew setting by rotating the
airscrew (89) counterclockwise to lean
the mixture and clockwise to richen the
mixture.
Note: The fuel mixture is too rich if
when openning the throttle rapidly the
engine emits white smoke and
“stutters” or “stumbles.” Correct this
by rotating the airscrew counter-
clockwise
1
/
4
to
1
/
2
turn at a time until
the engine transitions smoothly without
hesitation upon opening the throttle
rapidly.
The fuel mixture may be too lean if the
engine stops at the lowest idle position
or if the engine stops when the throttle
is rapidly opened from idle. Attempt to
correct this by rotating the airscrew
clockwise
1
/
4
to
1
/
2
turn at a time until
the engine transitions smoothly without
hesitation upon opening the throttle
rapidly. If the situation is not rectified
by clockwise rotations of the airscrew,
turn the airscrew counter-clockwise in
1
/
4
to
1
/
2
turn increments.
C A R B U R E T O R A D J U S T M E N T S
7
Saito Single Cyl Manual 9-00 9/11/00 10:06 AM Page 9
Summary of Contents for FA-30S (H)
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