I have a chinagirl motorized bike with a NT carburetor and I could not get it to idle down. Apparently there was an air leak where the carb neck entered the head intake tube. The only way I could fix this was to use gasket cement on the connection then tighten the compression clamp over this. Now I cannot get it to start at all. Cleaned the plug but not even a putt-putt. Any suggestion are appreciated.