i have it running on a tecumseh carb that was fabricobled on. that narrows it down, to a flat tank top, or a bad spring. i broke the choke rod, so im gonna have to 3d print one. it is a fixed jet carb, and i cant remove the jet, to get to the emulsion tube, since it is cast in. im gonna pull the welch plug, and maybe the balls, assuming i can get the oversized balls from briggs, or crossref the numbers over to mcmaster