O.S. Engines FF-320 - Manual (Page 11)

20
Start the engine.
open the throttle fully .
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 5 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
Re-set the idle speed
a little higher
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.
Approx 40˚ open from maximum
r.p.m. setting.
Yes.
No.
Yes.
Engine stops.
Engine stops.
Disconnect the glowplugs from the battery.
Make sure that all 4 cylinders are firing.
Make sure glowplug switch is on.
The engine hesitates before picking
up to full speed, or appears to run at
medium speed with reduced power.
Check mixture adjustment at idle
speed. Make sure that all cylinders
are firing.
Adjustment should be carried
out after stopping the engine.
Do not move needle-valve
while adjusting other controls.
Repeat the procedure while opening and closing the throttle until the best result is obtained.
Attention: Do not leave the battery connected while adjusting the carburetor.