O.S. Engines 12TG-PX - Manual (Page 14)

26
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 15˚ and try again.
Run the car on the track until one tank of fuel has been
consumed, then close the Needle-Valve 15˚ and run
the car for 3 to 5 full tanks of fuel. Repeat this
procedure until approx. 1 liter 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˚.
Needle
The position of the needle-valve
when starting the engine.
Close the needle-valve approx.
15˚ after running the vehicle for
3 to 5 full tanks of fuel.
Repeat this procedure until
approx. 1 liter of fuel have
been consumed.
Note:
In the event of any major working parts (e.g.
piston/cylinder liner assembly) being replaced or the
fuel being changed, especially to high nitro fuel, the
complete running-in should be repeated.
Warning!
Do not touch rotating parts, engine and silencer
when stopping the engine as they become very hot,
and contact with them may result in a serious burn.
To stop the engine, close the throttle to idle speed
and shut it off completely with the trim lever on the
transmitter then cut off the fuel supply by pinching
the fuel delivery tube to the carburetor.
Fuel
How to stop the engine
27
FINAL ADJUSTMENT
Throttle
Stop Screw
Needle Valve
Metering
Needle
Open Close Close Open
Needle Valve Metering Needle
More fuel Less fuel More fuel Less fuel
Final adjustment should be carried out only after the running-in has
been completed.
Needle Valve
Throttle
Stop Screw
Mixture Control
Screw
Mixture Control Screw Needle Valve
Open
More fuel
Close
Less fuel
Open
More fuel
Close
Less fuel