baconteeth: i had EXACTLY same problem with my 80cc kit i got online from outfit in canada. kit was pretty good, install alot of fun, but idle non-existent and not much power, hard to start, all the typical symptoms of fuel/carb/air problem. removed carb and float bowl to have a look, moved needle clip to middle groove so i had a baseline, resealed carb end that slides onto manifold. before i installed the carb though, i inspected manifold, ground out intake port end to match port on cylinder, cleaned up gasket to match port as well, and REALLY sealed up the manifold to cylinder area extremely well as this seems to be a problem area with most all these kits. cured all my problems doing that. hope this helps