I have a T9.9 as well, I have a hard time believing it'd get 10-12 knots with 9.9 hp; but that hull weighs around 600 lbs per the website. Using...
Any chance you can try a 4-blade prop?
I agree. The Yamaha T9.9 comes standard with a 11 3/4" x 7" prop and a 2.92:1 gear ratio, producing a ton of low end thrust, similar to putting...
I spent a better part of last winter installing a Yamaha T9.9 onto my 21' walkaround following the advice I found on a different website. Cost me...