O.S. Engines 55AX - Manual (Page 16)

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IDLING ADJUSTMENT CHART
Start the engine.
Make sure that the throttle is
fully open.
Adjust the needle-valve.
Close the throttle gradually.
Set the idle speed
Open the throttle fully.
Does the engine
regain full power?
Continue running at high speed
for 10 seconds.
Close the throttle.
Run at idle speed for 5 seconds.
Does the engine stop?
Apply full throttle.
Does the engine
regain full power immediately?
OK
Refer to the next section.
Re-set the idle speed 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.
20-45 open from maximum
r.p.m. setting.
Yes.
No.
Yes.
Engine stops.
Engine stops.
Disconnect the battery
leads at mid speed.
Engine stops.