I had a 25hp tiller on a 14ft Alumnacraft jon boat and it got us where we wanted to go rather quickly ..... think it was also maxed out on HP but like CTFSHWHISKER said, check the plate if you got one.....no plate, call the dealer or manufacturer who has 'em and check for sure..... don't want to overpower and end up in the H2O :-) tight lines.......