Instruction manual

5. Repeat the procedure of alternatively running
the engine fast then slow by varying the needle
valve position. Gradually increase the short
periods of maximum rpm (do not exceed 4,500)
running until one full tank of fuel has been
consumed in this manner.
Caution: Do not lean out the fuel mixture at this
stage. This could result in the seizure of the engine.
6. After the engine has been run-in on the ground,
flights in the air should be at a moderately rich
setting. After each flight, close the needle valve
slightly, carefully watching the rpms with your
tachometer. Do not exceed 8,000 rpm during
these first few flights.
7. After several tanks of fuel have been run through
the engine in flight, the carburetor should be
ready for setting for optimum performance.
Note: While the engine is being "run-in", the carb-
uretor cannot be expected to show its best response.
Adjusting the Carburetor
Once the engine has been "run-in", adjustments to the
carburetor may be necessary to obtain more desirable
throttle responses. The low-speed or idle mixture
needle valve is pre-adjusted at the factory for best
performance during break-in.
Note: The FA-200Ti/100Ti use(s) a remote high
speed needle value for safety purposes.
Two adjustable controls are provided in the
FA-200Ti/100Ti carburetor.
●
High-Speed Needle Valve: Used to adjust the
fuel/air mixture when the throttle is fully open
●
Low-Speed or Idle Needle Valve (screw): used to
adjust the fuel/air mixture at half and idle
throttle settings to obtain steady idle and smooth
transition to medium speed.
1. Set the throttle to
1
/4 open and start the engine,
letting it warm up for a few minutes before
making any adjustments.
2. Open the throttle fully and gradually close the
high-speed needle valve until the engine is
running at its optimum rpm for flight. This will
be
1
/8 to
1
/4 open from the maximum rpm setting
(ground, not to exceed 9,200 rpm.).
Caution: Be sure the engine is fully "run-in"
before allowing it to operate at a continuous
"full power" setting.
3. Close the transmitter throttle stick to idle and allow
the engine to run at idle for approximately 5 seconds,
then slowly move the throttle to the full throttle
position allowing the carburetor throttle arm to
move to the fully open (high-speed) position.
4. a. If the engine hesitates before picking up rpm's,
and has a low-pitched exhaust sound accompanied
by an excess of exhaust smoke, it is probable the
low-speed (idle) needle valve setting is too rich.
You will need to adjust the low-speed needle valve
by turning it clockwise
1
/4 turn (45 degrees).
b. If the engine hesitates or seems to cease firing for
a moment, before increasing speed, it is likely that
the low speed needle valve is set too lean. It will be
necessary to turn the low speed needle valve counter-
clockwise
3
/4 (90 degrees) of a turn, then clockwise
1
/4 (45 degrees) of a turn.
Remember to turn the low-speed needle valve
1
/4 (45
degrees) of a turn to start, then as response of the
engine improves, turn the valve only
1
/8 (30 degrees) of
a turn at a time. Repeat the adjustment steps a step at a
time, carefully observing the rich or lean performance,
until the engine responds to throttle changes quickly
and positively.
Note: Once you have set up the carburetor, the
settings should not have to be changed. The
exceptions would be minor changes due to
variations in atmospheric conditions. Slight
adjustments to the two needle valves can be
anticipated for optimum performance due to changes
in fuel, glow plugs, or propellers. Remember that
when you make a change in settings, fly the aircraft
with the high speed needle valve at approximately
1/8 to 1/4 turn open from maximum rpm as a safety
measure before "fine tuning" the settings.
8
High Speed Needle Valve Fuel Nipple