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time for some troubleshooting.
The engine starts very easily in the start position, but within a few seconds it starts to spit back from the port where the slow needle is, and from the carb throat. Enriching or leaning the mixture via slow needle both cause a momentary RPM increase, then spit and slowdown. Pumping the primer during a stumble causes a stall.
Tested again. Bogs on throttling up, stalls on throttling down in drive but idles okay in neutral. Really smoky, really smelly like too much oil, but I mixed TC-W3 at 16:1 in a gallon gas can. Some oil scum on the sides of the barrel and on top of the water once it settles, and a greasy coating on the lower unit.
The lower cylinder is still reasonably cool to the touch after this test run, but the gas tank and Ready Pull are hot.
Video here: https://www.youtube.com/watch?v=DEpSBAkpSvg&feature=youtu.be