Last winter I put a 1989 Yamaha 70hp 2 stroke on my 1997 16' aluminum Crestliner. I don't know the make of the prop but it is a 13.5"X17 SS 3 blade. The boat weight is probably around 2000 lbs loaded. Currently I am running at 4600 RPM at WOT. It doesn't jump onto plane but it is okay. I get conflicting info about WOT RPM's as 4500-5500 and 5000-6000. I think through research that the lower RPM is correct. My question is should I change to something like a 13.5X15 to increase the RPM's to something closer to top end or just leave it as is? I would also like to know if anyone knows for sure what the WOT range truly is. If it is the higher 5000-6000 then I should really look at changing props. Any info is appreciated.
