You may have to remove the carb and clean all the jets and the internals of the carb. Remove the jets when cleaning. You can use a torch tip cleaner or the wire from a wire brush to clean the insides of the jets.
try checking to see that your choke cable is hooked into your carburator. I recently had this probelm and found out that the threads had gotten weak and the choke cable came out of the carburetorMy 4 wheeler will not start. Was running when I parked it a few weeks ago. It acts like it is not getting fire but checked coil and plug is arcing. Checked fuel filter. Is problem in carberator? Battery is good.