O.S. engine FS-40S-C Owner's Instruction Manual page 15

With an aircraft engine, cooling is also aided, in
large measure, by the slipstream and some
model car enthusiasts elect to carry out initial
running-in, in this way by bench-mounting the
engine and temporarily fitting it with an aircraft
type drive hub and propeller. In the case of the
O.S. FS-40S-C, however, the fact that it is a four-
stroke engine with inlet pipe and carburettor
mounted high on the cylinder-head, means that
each charge of rich, cooling, fuel-air mixture is
admitted directly into the cylinder, instead of
being pre-heated in a lengthy journey via the
crankcase, as in the usual two-stroke model car
unit. With extra care, the FS-40S-C can,
therefore, be run-in ready-installed in the car.
Turn the needle-valve gently clockwise until it
stops. Do not use force to turn the needle
beyond this point. Now reopen it 1 3/4 turns.
Set the throttle-stop screw
so that the minimum
throttle opening
setting) is approximately
2mm.
Switch on the transmitter, followed by the
receiver. Close the throttle stick and open the
throttle trim lever to the idle setting.
Connect the glowplug battery and apply the
electric starter. As soon as the engine starts,
disconnect the glowplug battery, keeping the
engine running slowly on the rich needle set-
ting. (If necessary, make a slight readjustment
to the throttle stick to keep the engine idling
steadily.) If the engine stops, allow it to cool for
a minute or two before restarting it. In fact, short
runs, interrupted by brief cooling-off periods is
good practice during running-in.
14
2mm
(idle