Setup; Engine Fine Tuning - Reely 1:8 GP Buggy Ultra Sonic 4WD RtR Notice D'emploi

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8. Setup

a) Engine fine tuning
After the run-in phase of the engine, you can start the fine tuning to increase the performance. To that effect, optimize
the mix preparation for idle speed and change-over at the idle speed mix adjusting screw and at full throttle on the
main nozzle needle.
This fine tuning is significantly simplified thanks to the carburettor with the material combination aluminium/plastic.
Full-metal carburettors become very hot during operation. As a result, parts of the fuel already evaporate in the
carburettor.
The carburettor setting selected while the engine is cold therefore does not remain constant during operation. The low
heat absorption of the plastic prevents this effect.
Adjusting the main nozzle needle (full throttle mix)
• Start the engine and remove the plug connector.
• Let the engine warm up for approximately 1 min.
• Drive the model as usual.
• If the engine runs 'too fat', 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 light white trail of smoke should always be visible coming out of the exhaust
pipe.
For an even increased performance, you can change to a fuel with up to 30% nitromethane. However, there
is the danger that the engine would show no satisfactory road performance any more, if you return to a fuel
with a lower nitromethane share.
If you permanently want to drive with a fuel with a high nitromethane content, we also recommend replacing
the present with a thicker cylinder head gasket to reduce compression.
If you do not reduce the compression, an overheating of the engine and faulty run can be the consequences
Adjusting the idle speed mix adjusting screw
• Start the engine and adjust the main nozzle needle as described.
• Reduce the speed until the centrifugal clutch does not engage any more and the wheels do not turn any more when
lifting the model off the ground.
• Leave the engine running in idle speed for approximately 10 – 15 seconds.
• While you are holding the model with your hand, drive at full throttle once briefly and strongly.
Make sure not to touch moving parts!
• If the engine stalls as soon as you run at full throttle, then the idle speed mix is too lean.
• Enrich the mix by unscrewing the screw by 1/16 rotations 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 small delay in response is normal.
• If the engine smokes strongly during transition from idle speed to full throttle and sounds very rough, then the mix is
too fat.
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