Bought this Neptune single 2A-38 (1938 model) ten years ago off Ebay. Didn’t run like it was supposed to. Just now overhauled it. Jokes on me, I was sold the wrong prop. It tried to back it’s way against the barrel. switched prop from a bigger Neptune. Now I get to deal with the carb needle, mag setting, and throttle setting. Unlike my newer Elgins, the mag setting is independent of the throttle. I’ve got it popping and ready to run but can’t find the right combination of positions. Any ideas?