The Yamaha 115 SHO is the lightest per HP you MAY/MIGHT/MAYBE have a shot at. 386 in 25". I compared weights of the big 3 recently in four stroke. The only caveat is Merc only advertises their short shaft which would be 20". In my opinion, the Merc 150 and Suzuki 140 shine pretty bright at this time. I have never owned either.
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