Colin wrote:
1996 Maxum 2000 SCL (20
ft). The main engine is a 190HP mercruiser but the boat is fitted with a
transom for an auxiliary outboard.
Can anyone recommend a suitable size of engine for this?

"Dan" wrote:
go for a 15hp so you can get
upstream at a reasonable rate of speed. The price difference from a 9.9
is negligible.

"Calif Bill" wrote:
An 8 HP high thrust will drive that boat as fast as any 15-25 hp motor.

I'd think in terms of "thrust" (large dia prop, low gear ratio), as
well. Extra horsepower without the high thrust won't be of any help in
this application.

Rick