Toolbagtyler said:

Thanks. Wonder if I should be looking at an 8 or 9 instead of the 7. How much rpm did you gain from the 9? I was figuring 200 per inch.

I heard that 200 an inch thing also. I’m my case i gained 700 rpm going from 10 to 9. The mathematical difference between the two pitches is over ten percent, a little over 500 rpm. I attribute the remainder of the gain to getting the motor back in its power band. My boat was a fully loaded 1436, maybe a little overloaded, two big guys, trolling motor and battery, etc. The 15hp with a 9 pitch did a good job on this boat. Got the boat up on plane easily and cruised along at 18 mph or so. So with the 14’ boat, with just me in the boat, the 10 worked the best, topped out at 20. Loaded the 9 was the ticket. The 8 was overkill, jumped up on plane, but cut the top speed down to 17, and the motor over-reved, got sold on eBay, most of my $55 bucks or so back.

Another member of this forum had the same result with an OMC 15 2 stroke. He dropped from ten to nine and gained 700 rpm.

If I were you I’d start with the 9 and go from there. I’d be interested in what your experience is either way?

Sent from my iPad using Tapatalk