Max H.P for a 20' Seafari.

[Fr. Frank]

Yup, over 20', there is no legal limit to the horsepower you can hang on the back. Just add a bow roller, or a swim platform to get over 20'.

HOWEVER, the 20' hull (19'8" actual) was designed for an outboard motor weighing LESS than 300 lbs.

I've put a 245 hp motor (Merc 2.4L Bridgeport) on the back of one, and I've rigged them new with just 85 hp. I had 200 on the back of my own Seafari before changing to a 90 hp Optimax. Fuel economy with the 200 was just under 2 mpg. Fuel economy with the 90 Opti was about 6 mpg. Cruise speed with both motors was 23-25 mph. Top end with the 200 was about 50 mph, with the 90 about 35 mph.

I think the late 80's Mercury inline 6 cyl 2-stroke 115/140 hp or the late 80's through late 90's 115/130hp V4 Yamaha's are great for the 20' SeaCraft. These are older lightweight motors with plenty of power, and you can find really good freshwater used motors across the upper mid-west.