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Correct me if I'm wrong but I was told 75 horse was the max for a 170. I wanted to put a 90 2 stroke on mine but was told it would invalidate the warranty. Plate near engine says 288 max weight, and the owners manual says 75 horse max. With that said what i don't understand is the 04 90 horse was well under the max weight plate. Also I understand prior to 04 you could get a 90 on a new 170.
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