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I have a 170 CC with a 70 2S Yamaha. Never have done better than 41 mph. I suspect that you have as much top end as you are going to get. Possible couple of mph by going to stainless, but you'll pay big for doing that if you hit anything with it. Got some sort of hydrofin? Faster to plane, but it will cut your top end. I lost about 3 mph.
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