Originally Posted by dvu
I was wondering if I could get some help with my nitro car. When i start up my HPI R40, it seems to idle just fine. But after I run it for a while and the engine gets warmed up, it still wants to inch forward when the throttle is in neutral. I figure it's running too rich and so I've turned down my high speed needle, but if i turn it down too much when i lay on the throttle the car dies so I the have to lean out the high speed. Do I need to be tinkering with the low speed needle instead? Any suggestions would be great.
why dont you just trim your throttle down a bit, your clutch is engaging at the higher rpm, spometimes you have to play with your trim to get the right rpm especially when rpm changes during operation.
just retune it and go from there remember get the car operating at its fastest straight line speed with the highset needle and then back it off a touch and then make sure you car is accellerating well off the start with the low set and adjust your idle with your idle screw and watch your smoke and temp. if your not sure about getting your engine tuned there is some info here on rctech.