I am re-powering my 16.5' aluminum mod v boat with 88" beam(1000 lbs empty) from a 70hp with 2.15 gear to the 90 sho with a 2.33 gear. Currently I am running a 13.5" x 15 aluminum and am getting to 6200 at full throttle and trimmed up. From looking at the Yamaha prop selector, they suggest 3...
