I am sure you checked this, but make sure all the lines are clear and clean. The air tube from the tank is open. Sometime that can get stuck with gunk and then there is no air in the fuel tank and thus, not fuel to the carbs.take the carbs off and clean em good, put clean, no ethanol gass in it. and go fromt there if that dont work, it may be electrical as well. other than that, it may be mechanic time.
dano
