hey guys i recently did a 70cc swap on my derbi hunter but I cant keep get it running correctly. during my first install of the kit i broke off a piece of the cylinder skirt but decided to install in anyway as it was only the very bottom part. I an it with the exhaust off which seemed to work fine the once I put the exhaust on and ran it for a longer period of time it got worse and worse until it could only idle and now sometimes it won't even do that. i think i might have an air leak in my cylinder. what do you guys think?