O.S. Engines IL-300 - Manual (Page 11)

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Set the throttle valve approximately 1/4 open from the fully
closed position. 4.
Fully open Fully closed
Set at this position
Position the throttle stick at 2-3 scales advanced from the fully
pulled down position. Turn the prop “backwards” (clockwise)
by hand until it is against compression. This is to enable the
kinetic energy of the prop to subsequently assist the starter
through the compression stroke to start the engine.
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.
Connect the battery to the glowplug.
Electric starter
Make sure that the
direction or rotation
is correct.
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When the engine starts, open the throttle valve fully and
keep it running initially (approx. 10 seconds), with original
needle-valve setting. 6.
Open the
throttle fully.
Make sure that all four cylinders are firing 7.
The engine is running properly if white smoke is emitted
through all four 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.
A slight spray of fuel may be emitted through the exhaust
pipe if a cylinder is not firing.