I have a 1981 QT50 that we put a Malossi 70 cc kit on 3-4 years ago. Not sure what happened to it, but it semi locked up one day and we are redoing it. I believe it was running lean. It gets ridden very little and I'm no mechanic. My guy said to get another 70cc kit and I have. Is there a different carb we should run on it, or does it need to be jetted differently? I want to keep exhaust stock as I want it quiet.