I've got a puch maxi that is having trouble idling. It has a brand new engine in it, a 14 bing carb, and a 60 jet. I can get it to start by opening the throttle all the way, but it won't start with the choke down and the throttle closed. Once it is started, it will rev and ride just fine (well not exactly fine, maybe a little slow), but as soon as the throttle is closed, it revs down and dies. I've adjusted the idle screw with unfortunately no avail. There's also a bunch of smoke coming out of the magneto case.
Also, when the throttle is closed and I pedal, i'm not sure how to explain this, it sounds different. Like thinner somehow. Could this be a clutch issue?
Any ideas on how to get it to idle smoothly? Any help is greatly appreciated.