Vehicle Configuration Options; Fine Tuning The Engine - Reely 1592466 Notice D'emploi

11. Vehicle configuration options

a) Fine tuning the engine
After completing the break-in phase (see section 8. h), you can fine tune the engine to increase performance. This
works by using the mixture adjustment screw and main nozzle needle to optimize the fuel mixture for when the engine
is idle (and for the transition to full throttle).
This fine tuning process is made easier by the fact that the carburettor is made of aluminium and plastic. Conventional
pure metal carburettors get very hot during use, which causes some of the fuel to evaporate when it is in the carburet-
tor. Plastic prevents this from happening.
Adjusting the main nozzle needle (full throttle mix)
• Start the engine and remove the glow plug starter as usual.
• Let the engine warm up for one minute.
• Drive the vehicle as usual.
• If the mixture is too rich, make it leaner by turning the main nozzle needle inwards. Turn the needle by 1/16 of a turn
each time until you reach the desired setting.
• Make sure that the mixture is not too thin, otherwise the engine may not be sufficiently lubricated. A light white trail
of smoke should always be visible coming out of the exhaust pipe.
Increasing performance by raising the nitromethane content
As stated in section 8. i), the nitromethane content should not normally exceed 25%.
To improve performance, you could switch to a fuel with a 30% nitromethane content. However, in this case the engine
may not perform satisfactorily when you switch back to a fuel with a lower nitromethane content.
If you wish to continuously use a fuel with a high nitromethane content, we recommend replacing the cylinder head
seal with a thicker model to reduce the compression.
If you do not reduce the compression, the engine may overheat and not function properly.
Adjusting the idle mixture adjustment screw
• Start the engine and adjust the main nozzle needle, as described above.
• Reduce the speed until the centrifugal clutch does not engage any more and the wheels do not rotate when you lift
the vehicle off the ground.
• Let the engine run idle for 10 - 15 seconds.
• Hold the vehicle in your hand and apply a short burst of the throttle. Be careful not to touch moving or hot parts!
• If the engine stalls at full throttle, the idle mixture is too lean.
• Switch off the engine and thicken the mixture by turning the screw anticlockwise by 1/16 of a turn.
• Restart the engine and repeat this process until the transition from idle to full throttle is smooth and fast. A small
delay is normal.
• If the engine makes a loud noise during an abrupt transition from idle to full throttle, the mixture is too oily.
67