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8
E N G I N E
O P E R A T I O N
The use of a tachometer is encouraged
for setting the high-speed needle
valve(s) (85) prior to flight. The peak
rpm should be obtained and then
reduced by approximately 200–300
rpm by turning the high speed needle
valve(s) counterclockwise.
Low Speed
Carburetor
Adjustments
The low speed, or idle needle
valve(s), or airbleed screws(s) (89),
is/are pre-adjusted at the factory for
best performance during break-in.
After break-in it may be necessary to
"fine tune" the low speed adjustment
using the following procedure:
1. Start the engine and let it warm up
prior to attempting any adjustments.
2. Close the throttle slowly and
adjust the low speed setting by
rotating the needle valve(s) (89)
clockwise to lean the mixture and
counterclockwise to richen the
mixture. The direction of rotation is
reversed for the Saito FA-100T and
FA-182TD. These engines are
equipped with airbleed style
carburetors, rotating the airbleed
screw clockwise will richen the
mixture. If the airbleed screw is
rotated counterclockwise the mixture
will become lean.
NOTE: The fuel mixture is too rich
if when you open the throttle rapidly
the engine emits white smoke and
"stutters" or "stumbles." Correct this
by rotating the idle needle valve(s)
clockwise (or airbleed screws
/
/
1
1
counterclockwise)
to
turn at a
4
2
time until the engine transitions
smoothly without hesitation upon
opening the throttle rapidly. The fuel
mixture may be too lean when 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 idle needle valve(s)
counterclockwise (or airbleed screws
1
/
1
/
clockwise)
to
turn at a time until
4
2
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(s) (or airbleed screws
clockwise), try turning the idle needle
valve clockwise (or airbleed screws
1
/
1
counterclockwise) in
to
4
increments.
3. After obtaining the proper idle
setting, the low rpm setting can 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.
/
turn
2
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