O.S. Engines FR5-300 - Manual (Page 9)

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Make sure that glowplugs are not connected to the battery.
Do not heat the glowplugs while priming. (Fig.17). 2.
Do not connect the battery to
the glowplugs while priming.
Fig.17
Open the throttle valve fully, close the choke valve and turn
the propeller counter-clockwise through two revolutions.
(Fig.19 & 20) 3.
Fig.18
Fig.19
Open the
throttle fully.
Close the choke valve. Turn 2 revolutions.
If very strong compression is felt when trying to turn the
propeller counter-clockwise, too much fuel has been drawn
into the engine. In this case, do not use force, but release
the choke valve and turn the propeller clockwise slowly to
eject excess fuel through exhaust pipes.
Fig.20
Do not apply the starter with the choke closed.
Warning! Never close the choke valve when applying
the starter. Such an action will cause an excess quantity
of fuel to be drawn into the cylinders and result in
hydraulic lock that may damage the engine. (Fig.20)
Excess fuel in the carburetor may drip into the engine
compartment when the choke valve is reopened. Therefore,
it is advisable to drill a drain hole in the bottom of the engine
bay or cowling and to apply fuelproof paint to the
surrounding surfaces to prevent fuel from penetrating the
airframe structure.
Release the choke control and
immediately turn the propeller
counter-clockwise several
times so that fuel is drawn well
into the cylinders (Fig.21). 4. Fig.21
Set the throttle valve approximately 1/4 open from the fully
closed position. (Fig.23). 5.
Fig.22
Fully open
Fully closed
Set at this position
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Starting with an electric starter (Fig.23) 6.
Make sure that the direction of rotation of the starter is
correct.
Connect the glowplug battery.
Apply the electric starter.
Fig.23
Connect the battery
to the glowplug.
Electric starter
Make sure that the
direction or rotation
is correct.
When the engine starts, open the throttle valve fully and
keep it running initially (approx. 10 seconds), with original
needle-valve setting. 7.
Fig.24
Open the
throttle fully.
Make sure that all five cylinders are firing. 8.
The engine is running properly if white smoke is emitted
through every exhaust pipes. A slight spray of fuel will be
discharged through the exhaust pipe or 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.
Fig.25
Now disconnect the glowplug battery. 9.