O.S. Engines 25LA - Manual (Page 25)

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 25.
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˚ open from maximum
r.p.m. setting.
Yes.
No.
Yes.
Engine stops.
Engine stops.
Engine stops.
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