Have you ever changed the spring for the lever in the carb? Apparently those are no longer available so if you haven’t, don’t. Have you checked the pop off? And looked for leaks past the needle or seat while doing the pop off? Have you checked the carb to see if it will hold pressure after it’s back together to be sure the lever is not holding the needle out? Maybe someone’s been bending the lever? Trying to achieve proper pop off?
Also worth checking the fuel tank relief valve, perhaps it’s not opening causing a positive pressure in the tank forcing fuel into the carburetor? I can’t remember what pressure it’s supposed to open at? I think it’s 3 ponds for the relief valve and 1.5 pounds for the valve that allows air back in, but best to check. There should be a slightly positive pressure in the tank but not more than 1.5 pounds or so.
Are you sure it’s flooding? And not starving for fuel? Have you taken the plugs out after it’s died on you to look at the Color of them? Is it dying at higher throttle or while idling or no difference? Will it start right back up after dying? Does pulling the choke help when it’s about to die out?
