Repowering my old 16ft aluminum boat thinking of going 4 stroke but have a question

[canadianboater86]

Hi All i have a 1976 springBok 16 ft boat that’s similar to the starcraft ss that has a 76 johnson 85 v that unfortunately doesnt have power tilt & trim and i hear it can be hard to find the factory unit . I’ve looked at the power jacks like bob’s or panther but there $1600-2700 here in Canada . so unless i can find a used jack plate it doesn’t make sense to spend that much . I’m thinking of repowering with either a 2 stroke from the 90s like a yamaha or johnson or a early 4 stroke from early to mid 2000s

My question is if i go 4 stroke do i go up in power from my original 85hp johnson or go down because of weight. Would a 60hp 4 stroke be enough for a mostly fishing type boat

this is a project boat and i’m redoing the floor with 1/8 aluminum checker plate and redoing the transom sealed with west system epoxy so that will be able to handle the 4stroke

 

[Ifishmuskie2]

Was the original engine hp rated at crank or prop shaft?

 

[racerone]

A 1976 motor would not be prop rated.----Your location in Ontario?