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8
E N G I N E
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 te
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.
O P E R A T I O N
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 counterclockwise) 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 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 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(s) (or airbleed screws
clockwise), try turning the idle needle
valve clockwise (re airbleed screws
counterclockwise) in 1/4 to 1/2 turn
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.
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