With a gallon of fuel through the engines, one is fine and the other is poor.

Both were run in identically on the same day in the same operating conditions, fuel was identical and all set up procedures were as well. All from the book using the directed 3 turns initially for the first tank. Fuel filters are fitted and I cleaned the needles as well when it was running poorly to remove that option.
I'm guessing poor quality checking from the factory on this engine now, and am off to buy another rather than fiddle about with spare parts. At least I can part it out for future problems on the two operating engines.

Coulda put the extra towards a pair of OS engines I guess.....