blow air in through all passages, keep in mind some needles will blow out if not properly removed, or cared for. Make sure main jet is clear by removing it, and blowing air in through and around the jet. Make sure needle and floats are set to spec, usually float will be level when upside down, however some differ. clean the throttle body, and the choke butterflys, to ensure proper function. Some bikes are (auto-choke) clean all electrical connectors with die elecrtric grease.