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As a practical matter, there is not a single outboard made today, including the Yamaha V-8s that would even begin to be too heavy for the transom of the Outrage 25.
Historically, the 25s were often powered by twin two stoke outboards that weighed 450 pounds each or 900 pounds total. Live it up!
I'm thinking the suzuki 300 sounds like a good fit. I got on the yamaha and suzuki web pages and the gas numbers are way better for the suzuki. I like the sound of that! and at 605 lbs, its much lighter than the Yamaha 300.