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My plate says 388lbs max which I am close to with my 75 4stroke Yamaha. I remember though (whether I read it or was told it) the only difference between a 75hp and a 90hp was a computer chip. Maybe I'm wrong, but if the weight of the engine is still the same, would it void the warranty if you switched chips? In my opinion, and it's only an opinion, the 75 is plenty for the 170. Enough to pull a skiier and and I can slow it down to 2.2 mph by the gps to troll for salmon. Plus it takes barely any gas, I can barely hear it running, and I don't have to smell it if the wind is hitting me in the face.
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