If you are really just not getting anywhere with your car tune-up, best thing to do is to go back to basics.
Make sure your fuel tank and fuel lines are 100% clean. Check that your fuel tank seals when you close the lid. There is often an adjustment to tighten up the ‘O’ ring.
Make sure your fuel is fresh fuel. Never use fuel that’s been sitting in the tank or bottle for months. If in any doubt, you are better off buying new fuel. This could save you many hours of messing around trying to tune your RC car. Bad fuel = Bad running and impossible tune.
Restore your carb settings to factory defaults. Ensure you get these settings from the manufacturers manual. Not all brands have the same settings.
Ensure your idle setting has the carb aperture open at least 1-1.5mm or as indicated by the manufacturer.
Check that you have full throttle (carb fully open) and that when you apply the brakes that the car stops dead. A simple push test will do. When your controller is returned to idle, check the carb gap as mentioned in item 4
Check your glow plug status. Ensure that ALL coils glow during the test.
After carrying out the above steps, check to make sure that fuel is entering the carb during priming.
During tuning after starting your engine, start with the HSN (High Speed Needle) then move onto the LSN (Low Speed Needle).
Adjustments should be made in very small movements. No more than an eighth of a turn at a time.
With all the above in mind, you are aiming at setting your HSN so that when your car is under acceleration, there is a good bit of smoke coming out the exhaust. This ensures your engine is getting the proper cooling and lubrication.
If you are really not getting anywhere, don’t despair. Get your car down to us and we will sort it out for you.