O.S. Engines 25LA - Manual (Page 26)

CARBURETTOR AIR-BLEED ADJUSTMENT
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.
approx.
15˚
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.
Pre-Flight Check
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.
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