Just wondering, I did a search but came up with nothing
I run @ 4,800 pulling a tuber with two on board and a 13 x 17 prop , she screams great, but I have an idle issue I am working on taking advise from other posts.
do you have a GPS, I'm wondering what your speed is at WOT with the 13x17 prop, should be about 34-35mph @ 4800rpm. If your running faster than 35mph on GPS your tach is probibly off.
If your top rpm's are the same with or without pulling a water toy, somethings wrong. Verify your tach readings before you do anything else. You're 1000 rpm short. That's more than a prop change.