Some more detail would help. Does it need choke to start ? Does it run differently with the choke pulled vs open? Have you done any basic tuning on it yet (valve adjust, cam chain adjust, etc.) If you haven't found one yet, get yourself a manual, that will make things easier for you and for everybody else here to help you. Don't worry, pretty much any problem you have somebody on here can solve, just give as much info as you can to help. Welcome to the group!