Quote Originally Posted by 03RCode
Tr00f. Sounds to me like bad lean, generally if its getting hot enough for the pipe to glow red, its cutting out in the mid-range, and backfiring its lean. I'd be willing to be it runs better with the choke on then off, richen it up a little and your problem should be solved.
Yep. Adjust the float level a little higher and see what happens. You will have more fuel and could fix the possible lean issue. Like 03RCode said, witht the choke on you're kinda doing the same by adding the extra fuel. Hence why it started in the video.
Report back.