O.S. Engines 21VZ-B V-Spec - Manual (Page 20)

Run the car on the track until one tank of fuel
has been consumed, then close the Needle-
Valve 30° and run the car for another full
tank of fuel. Repeat this procedure until 1/2
gallon of fuel have been consumed, during
which time the throttle may be opened for
brief bursts of increased power.
Needle
The position of the needle-valve
when starting the engine.
Close the needle-valve approx.
30° after running the vehicle tor
one full tank of fuel.
Repeat this procedure several
times.
Note:
If the engine should need to be disassem-
bled (e.g. for cleaning or minor parts re-
placement), it is advisable to return the nee-
dle-valve to the original rich, starting set-
ting 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 or the fuel being changed,
especially to high nitro fuel, the complete
running-in should be repeated.
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 carburetor.
Fuel
Warning!
Do not touch rotating parts, engine and si-
lencer when stopping the engine as they
become very hot, and contact with them
may result in a serious burn.
Air Cleaner
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