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1939 Piper J-3 W&B/Mixture Control Question

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Feb 15, 2021
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Sheridan, WY (KSHR)
Hello all, we recently acquired a beautiful 1939 Piper J-3 Cub for tailwheel training in Sheridan, WY (KSHR). Airport 4,000MSL. The aircraft is equipped with a Continental C90-8F engine (200 hrs SMOH) and recent overhauled Stromberg NA-S3 Carb.

Couple questions for you:
  1. We are unable to find any updated weight & balance info after the aircraft was upgraded from 65HP -> 95HP. One would assume the useful load would increase with additional horsepower correct? I have calls outstanding to Continental for additional assistance but have not heard anything back yet.
  2. Also, the airplane came with no mixture control and was safety wired "full rich." The ferry pilot's trip from Washington to Wyoming was uneventful and even one our CFI's took a lap around the pattern with no issues on a 50 degree (F) day. The 3rd time we went to fly the plane the CFI reported the engine "sputtered some" during take-off and he turned back to land. After warming up the engine further a second time, he tried again only to have the same thing happen. Does anyone know where to source a mixture control kit compatible with the Stromberg from? A local A&P was able to adjust the carb but we want to have mixture control before summer and significant density altitude. Running into dead ends.
Any thoughts, questions or comments would be greatly appreciated...>JT

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