IMHWO (as a Tohatsu mechanic), Tohatsu has a motor specifically for that application. The MFS9.8A3 in UL (ultra long) version. Automatically comes with 4-blade High Thrust prop. Available either as Tiller or Remote, Electric or Rope start. The electric also has rope, in case your battery is dead. The electric models have 6-amp charging. Lowest cost OB in the US. Lightest in class. Most reliable anywhere in the world. I have the 9.8A3 on my Hinterhoeller HR-28, and it was a "downgrade" from an old OMC 15 from the '70's... Yet, Amazingly, actually has more thrust (cheating a little with the HT prop, especially in Reverse), and reaches the same hull speed. Just burns half the gas, and is so quiet that we occasionally thought it wasn't running when it was at idle.
Paul Van Voorhees
Certified Tohatsu TLDI Technician
Mgr, Obersheimer Sails
Buffalo, NY USA