I've read that if the mixture screw is turned in all the way that your idle should cut out. For me this is not the case at all. When I tinker with the screw the idle doesn't realy change much. Granted, If I turn it all the way out it will start to cut off but the most annoying thing is that the mixture screw seems so loose that it will turn itself in while I'm riding around. Any one have any idea what's going on here?