XS -

Welcome back.

You are looking at the EXACT combo I had. I had a 14' Crestliner jon boat with a Merc 20 prop, pulled it off and put a Mariner 40 hp motor, 28 hp at the jet, on it. Same powerhead as the Yama if you are looking at the 2 stroke. It weighed about 200 lbs. Definitely sat down a bit more than the Merc 20, but I ran it on alot of the rivers out here, including the mighty Columbia many times and it was great. The added power was welcome many times when I would be in flat, moving water. Never had a problem with the setup and now my friend has it. If I was doing it again, I would do the same setup.

I did have a riser bracket welded so I could raise the motor up about 4' so the shoe would sit correctly with the bottom.

Good luck.