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My unconfirmed info says 5,500 rpm If you give us your max rpm and speed and prop size we can better tell if your setup right.Also wouldn't hurt to know how the boat performs,hole shot etc.
I have a 13.75 x 15p prop. it's a bullet out of the hole and tops out at 34 mph. WOT it is right at 4900 rpms. I am usually at 4500-5500 ft. elevation.
At 5000ft you lose about 15% of your power Your description sounds pretty good especially if you go to lower elevations.From your description I wonder if your tach might be reading a little
low.See if you can borrow a shop tach to varify your numbers.
