O.S. engine MAX-12TR Series Owner's Instruction Manual page 15

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When the engine starts, first allow it to operate in short
runs on its very rich starting settings, with the glowplug
battery still connected and with its driving wheels clear
of the ground. The rich mixture will, under these
conditions, provide adequate lubrication and cooling,
indicated by profuse smoke from the exhaust.
•
Next, disconnect the glowplug battery and try
running the car on the track. If the engine stalls,
open the throttle fractionally, but try to keep the
engine running as rich as possible: if it stops
because of being excessively over-rich, close the
Needle-Valve 30˚ and try again.
•
Run the car on the track until five tanks of fuel has been
consumed, then close the Needle-Valve 30˚. Repeat
this procedure until around 5 times of fuel have been
consumed, during which time the throttle may be
opened for brief bursts of increased power. If the
engine stops at medium speeds, close the Mixture
Screw 45-90˚.
Needle
•
To stop the engine, close the throttle to idling speed,
then shut it off completely with the trim lever on the
transmitter. To cut off the fuel supply, pinch the fuel
delivery tube to the carburettor.
Remember!
If the engine should need to be disassembled (e.g. for
cleaning or minor parts replacement) it is advisable to
return the Needle-Valve to the original rich, starting
setting and check whether further running-in time is
required before the car is raced again. In the event of
any major working parts(e,g, piston/cylinder liner
assembly) being replaced, the complete running-in
should be repeated.
14
The position of the needle-valve
when starting the engine.
Close the needle-valve approx.
30˚ after running the vehicle for
every five full tanks of fuel.
Repeat this procedure around 5
times.