tenders is right, but I agree that is getting into fine tuning. Enjoy it running for now, but maybe report some idle speeds if you can so we can help decide if it is overpropped or not, and maybe get technical with vac loads and stuff later on. It seems most direct drive A-4s are overpropped (but I am not an expert)..and they struggle to push the boat at low (1700 RPM) and high cylinder pressure etc., And, on the back side of that, you might be running 3 knots + at idle with direct drive and too-steep prop.
I have a direct drive and the 10" x 7.4 pitch Indigo prop on my Cat 30 sings wonderfully at 1,950-2,000 RPM.
