I plan on getting a set of rings from Frank. The engine does have a bit of leak down when you turn it over slowly. If I can get only 500 more RPMs with new rings, I'll be very satisfied. I made a velocity stack out of a 3/4" PVC plumbing fitting today for testing purposes. I got another 100 RPM and had to lean the high needle 1/2 a turn.

Do you thing the stock fins on the flywheel are draging the RPMs down.