Adjustment Possibilities For The Model Car; A) Engine Fine Tuning - Reely ROAD Storm Devil Operating Instructions Manual

11.

Adjustment Possibilities for the Model Car

a) Engine Fine Tuning

After the run-in stage of the engine (see chapter 8. g), you may start the fine tuning process to increase the perfor-
mance. To that effect, optimise the mixture for idle speed (and transfer to full throttle) at the idle speed mix adjustment
screw and at the main jet needle for full throttle.
Adjusting the main jet needle (full throttle mix)
• Start the engine and remove the glow-plug starter as usual.
• Let the engine warm up for approximately 1 min.
• Drive the model as usual.
• If the engine runs ‚too rich', tune down the mix by twisting the main nozzle needle inwards by 1/16th of a turn until
you have achieved the desired setting.
• Make sure that the mix is not too lean. A slight white smoke vane should be visible from the exhaust at all times.
Performance increase by higher nitromethane share
As already described in chapter 8. h), the nitromethane share should usually not exceed 25% in racing operation.
For an even better performance, you can change to a fuel with up to 30% nitromethane. However, there is the dan-
ger that the engine would show no satisfactory road performance any more if you return to a fuel with a lower nitro
methane share.
If you want to permanently drive with a fuel with a high nitro methane content, we also recommend replacing the
present cylinder head gasket with a thicker one to reduce compression.
If you do not reduce compression, the engine may overheat and run incorrectly!
Adjusting the idle mix adjusting screw
• Start the engine and first adjust the main jet needle as described above.
• Reduce the speed until the centrifugal clutch does not engage anymore and the wheels stop turning when you take
the model off the ground.
• Leave the engine running at idle speed for approximately 10 - 15 seconds.
• While you are holding the model with your hand, drive at full throttle once briefly and strongly. Take care not to
contact moved or hot parts!
• If the engine stalls as soon as you run at full throttle, the idle speed mix is too lean.
• Enrich the mix by unscrewing the screw by 1/16 rotations counter-clockwise while the engine is switched off.
• Restart the engine and repeat the procedure until the speed transition from idle speed to full throttle is soft and
spontaneous. A short delay in reaction is normal.
• If the engine smokes strongly during transition from idle speed to full throttle and sounds very rough, then the mix is
too rich.
• Make the mix thinner by screwing in the screw by 1/16 rotations clockwise while the engine is switched off.
58