I have a Michigan Rapture thats 11 3/4 inches x pitch of 15" and it fits my small gearbox 13 spline 60hp 2 stroke. Performance was limited by the max 4800 rpm achieved. I have also run a 17" pitch quicksilver. Settled on a 13" pitch quicksilver, which I started with
. It runs to around 5300-5600 rpm and gets about 33 knots, quick hole shot with a full tank and 5 adults, 27 knots.
The gearbox ratio on this engine is quite high, 1:2.1. I think. The prop spins faster than most outboards hence the lower than expected pitch.