O.S. Engines Sirius7 FR7-420 - Manual (Page 11)

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Starting with an electric starter. 5.
Make sure that the direction of rotation of the starter is
correct.
Connect the glowplug battery.
Apply the electric starter.
When the engine starts, open the throttle valve fully and
keep it running initially (approx. 10 seconds), with original
needle-valve setting. 6.
Make sure that all seven cylinders are firing 7.
The engine is running properly if white smoke is emitted
through all seven exhaust pipes. A slight spray of fuel will be
discharged through the exhaust pipe of any cylinder that is
not firing.
If a cylinder ceases firing, reduce the throttle setting to
approximately 1/4 open from the fully closed position and
re-connect the glowplug battery. The rpm will increase when
all cylinders are firing steadily.
Now disconnect the glowplug battery. 8.
Adjust the needle-valve 9.
Abrupt adjustment of the needle-valve may cause the
engine to stop, especially when it is new and insufficiently
run-in.
As the speed of the engine does not instantly change with
needle-valve readjustment, small movements, with pauses
between, are necessary to arrive at the optimum setting.
Practical best (optimum) needle-valve setting
Approx. 45-90
Maximum rpm setting
("Lean")
"Rich" needle-valbe
setting when starting
the engine.
Rpm starts to decrease.
Close the needle-valve
gradually and slowly.
Engine stops.
With a propeller which the engine turns approx. 6,000rpm
with full throttle, one misfiring cylinder will drop approx.
500rpm and two misfiring cylinders will drop approx.
1,000rpm.
With fully throttle, close the needle-valve gradually to increase
the engine rpm. It is suggested to use a tachometer.
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Re-starting the engine when warm
To re-start the engine when warm, simply re-energise the
plugs and reapply the starter with the throttle in the idling
position. If the engine does not start, disconnect the battery
from the glowplugs and re-prime. Initially, the high
temperature inside the combustion chambers may turn the
liquid fuel into gas and emit it through the exhaust pipes.
Allow the engine to cool and then repeat the priming
procedure once or twice.
Note:
Make sure that the throttle linkage is made so that the
throttle is fully closed when the throttle lever as well as
trim lever on the transmitter are fully pulled down.
How to stop the engine
Pull down the throttle lever and trim lever on the transmitter
fully.