I have set all the float levels etc,But i still not 100% on the mixture adjustment screw,doesnt really give you a starting point for that in any of the articles ive found,I have got the car to run fine on the road,Get it to the race track and it plays up so its bloody hard to take it anywhere to give it a proper run before racing to see if it is fine,Also thinking prehaps timing could be playing a part as well