When I first bought my rap, I had tons of trouble with the carbs blowing off....the 27.5 pilot + a vacuum guage too dial in for highest vacuum solved my problem. I know the idle circuit is a tad on the rich side.....but I am out over 3 turns....rich is where I want my idle circuit. I have no idling or starting problems...pops or surges...it's all good [img]i/expressions/face-icon-small-smile.gif[/img]. I got my pilots and mains from carbparts.com....they are out of ohio.