So have you checked the choke? If the choke shaft top has a spring loaded control, it could be broken. Something easy for you to try would be to remove the air box so you can see the choke operation plus resecure the carb w/ the air box off and run it. If your float valve is damaged fuel should be more apparent. BTW, the carb pops off these easy where you can check the float and valve. If the tip is disjointed or you see a ring of wear, you may get by just replacing the float valve, which is easier to find in a kit. They do offer a kit that includes the seat as well, but you may be better off replacing it w/ an OEM carb.