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 5 more
tanks 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˚.
30˚
Needle
The position of the needle-valve
when starting the engine.
Close the needle-valve approx.
30˚ after running the vehicle for
one full tank of fuel.
Repeat this procedure several
times.
30˚
30˚
Warning!
Do not touch rotating
parts, engine and silen-
cer 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, 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.
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.
Fuel
21
Run the vehicle (with throttle fully open) over
the longest available straight course, in order
to observe the model's speed. Next return
the car to the starting point, close the Needle-
Valve 30˚ and repeat the run, taking note of
the improvement in performance. Continue
with further runs, gradually reducing the
Needle-Valve setting and aiming to achieve
the highest straight-line speed. Remember,
however, that, if the Needle-Valve is shut
down too far, the engine will overheat and,
accompanied by visibly diminished exhaust
smoke, the model will lose speed. At this
point, throttle down immediately, stop the
vehicle and reopen the Needle-Valve 30˚.
With the engine running, close the throttle
and allow it to idle for about five seconds,
then reopen the throttle fully. If, at this point,
the engine puffs out an excessive amount of
smoke and the vehicle does not accelerate
smoothly and rapidly, it is probable that the
idle mixture is too rich.
FINAL ADJUSTMENT
Having established the optimum Needle-
Valve setting, check the Mixture Control
Valve setting as follows.
In this case, turn the Mixture Control Valve in
case of the 11L and the Metering Needle in
case of the 11K clockwise 45 degrees. If, on
the other hand, the engine tends to speed up
momentarily and then cut out abruptly when
the throttle is opened,the idle mixture is too
lean. Correct this by turning the Mixture
Control Valve in case of the 11L and the
Metering Needle in case of the 11K counter-
clockwise 45 degrees.
