Aquasport Mechanicals - things that need a wrench, screwdriver or multimeter > Engines & engine woes

Yamaha 250 sho 20in shaft

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eman9502:
Hello , I’m currently restoring a 1974 222 flat back . I’m getting ready to re power it . Has anyone powered this hull with a Yamaha 250 sho 20in shaft on a porta bracket ? If so how did it perform?

RickK:
Welcome aboard eman9502.
The FB model was only produced up through '71. We have seen boats sold in '71 but not registered until '72 but certainly not '74.
We have a member that put a 250 on his flatback and he said that it was too scary to drive anywhere near wide open. The FB was originally designed for a 90 hp and most people are more than happy with a 150hp on it.
Be advised that a FB has a tendency to "bow steer" meaning that if a wave hits at the wrong angle the bow could dig in and all of a sudden you're pointing 90 degrees from where you just were. Pretty dangerous.
If you have a 12 degree hull, which was made in '74, you would be pushing the edge with the 250. most have a 200 or 225. The original specs were for a 140

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