Piper J3
Well Known Member
Actually, the latest KAI for the ULS installation uses a different cowl, different oil and coolant radiators and placement.
I'm playing devil's advocate here I guess, but I think removing the cooling shroud may be a significant factor in what you are experiencing.
"The troubles started when the mechanic opened his toolbox", author unknown.
Tony -
See Scott McDaniels comments regarding removal of cooling shroud on existing legacy RV-12... https://vansairforce.net/community/showpost.php?p=1405341&postcount=5
Looks like Van's vetted this pretty well.