I tried looking at female threaded caps, as on dirtbikes, but there's just so many. Male threads on the tank means you don't need a bung insert, just mold the threads on the top of the tank. If the threads are just the right height, I don't think it would look too bad. I suppose you could mold female threads on the tank as well though?
Jerry, what year is the XT? Plastic tech has come a long way since then, and maybe ethanol wasn't even in widespread use then?
Yes we can do the female threads also but my only concern with that would be stripping out. We have a variety of brass fittings to be moulded so i will have a look and see what would suit