30
Start the engine.
Make sure that the throttle is
fully open.
Adjust the neede-valve.
Close the throttle gradually.
Find the idling position.
Fix the idling position.
Open the throttle fully.
Does the engine
regain full power?
Continue running at high speed
for 10 seconds.
Close the throttle.
Run at idling speed for 5 seconds.
Does the engine stop?
Apply full throttle.
Does the engine
regain full power
immediately?
OK
Refer to the CARBURETTOR
AIR-BLEED ADJUSTMENT
section on page 31.
Re-set the idling position at
a little higher r.p.m.
Set the throttle opening by
means of the throttle trim on
the transmitter so that the lowest
practical speed, without risk of
the engine stopping,is obtained.
The position where the lowest
possible r.p.m. ,with steady
running, is obtained.
20-30
o
open from maximum
r.p.m. setting.
Yes.
No.
Yes.
Engine stops.
Engine stops.
Engine stops.
31
15/25LA CARBURETTOR AIR-BLEED ADJUSTMENT
Pre-Flight Check
Start engine and adjust needle-
valve as previously described.
Close the throttle gradually.
Find the idling position.
approx.15˚
Hold the model.
Hold model level, then slowly raise its nose.
If revolutions increase.
If engine runs unevenly or stops.
Immediately point
nose down, so that
engine runs steadily
again.
Stop the engine.
Stop the engine.
Note: Stop engine by
pinching fuel delivery
tube. Do not touch
needle-valve.
Open air-bleed
screw.
Half turn at a
time.
Close air-bleed
screw.
Half turn at a
time.
Repeat the procedure while opening and closing
the throttle until the best result is obtained.
Attention: Do not leave the glowplug connected to the battery
while adjusting the carburettor throttle.
These adjustments can be
made without stopping the
engine.
However, it is advisable for
beginners to stop the engine
for safety reasons.
approx.15˚
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