weight of 2 stroke vs. 4 stroke

[say_der]

If an older boat is rated for say 50 H.P. that was for a 2 stroke.

A 50 H.P. 4 strokes weighs more. Would the H.P. rating still hold true or should the weight of the motor be factored into what size motor goes on a boat?

Thanks.

[minneman]

I own an older (84) lund WS 16, rated for a max hp of 50hp.
when I bought it it came w/35hp merc tiller.
that motor was perfect for 1 person in the boat, anyway i wanted to upgrade this year and was thinking like yourself about the 4 stroke and possibly a 50 hp.
decided after all to go with a used '2000 40hp 2 stroke w/trim/tilt, that added about 110 lbs compared to the previous setup.
I love what the 40 did for performance! but the weight issue made me deal with handling the boat different than before and the trailer now is toung light, so I need to load the boat accordingly. I have a transom mnt troller and battery in the stern too.
all in all it became a totaly new to drive boat. I cant imagine putting a late model 50 hp on the back as the tag on the boat rates it for.

[say_der]

If an older boat is rated for say 50 H.P. that was for a 2 stroke.

A 50 H.P. 4 strokes weighs more. Would the H.P. rating still hold true or should the weight of the motor be factored into what size motor goes on a boat?

Thanks.

[whitebearlakeguy]

Look at Honda, there motors are all four strokes and weigh much less than all the others.

[orngruffee]

I just put a 40 horse 4 stroke on an 89 backtroller.I have only had it out once but so far so good.I had a 25 2 stroke on it before.I don't think I want a 50 even though it is rated for it. It has power trim and tilt and there is a very fine line between sweet spot and bow steer.It is about 15 mph faster than the 25.