Quick question maybe you guys can help with

Changed to 3 blade prop and it went to 6000 RPM and 40 MPH.... thanks for all the help
Post up what you put on so it might help someone else.
Yes - I’m going to get all the specs of what I had and post it. It was a 4 blade by Solas
The issue may fuel related. That engine may have an electric suction pump, if so, there is little need for a check valve in the fuel tank pickup tube. New fuel hoses are known to have restrictions, as well as filters.