Here's my problem; I bought a '88 Four Winns 205 Sundowner, with a 5.7L OMC Cobra engine. Engine was seized, so I had it Completely rebuilt, everything new. I took it out for the 1st time today with a 15"-17 prop and it would only go 30 MPH & the RPM's wouldn't go above 4k. I changed prop to a...
