RE: 75 ax dies out at mid range
Usually, if the engine dies at midrange, it's too rich. That can mean that the low-speed needle's a bit on the rich side. It could also mean that the fit to the piston/liner is starting to go bad, though idle usually goes bad first. You may want to check out the entire fuel system to make sure it's clean and unobstructed. That's about the best we can do without our seeing the engine and running it ourselves.