With that use up 25hp would be fine to handle. One of the last of the 25hp 2-strokes (2006 ish) of any major brand would be fine... Mercury/Mariner, Yamaha etc.
If you fancied new the 3cyl Suzuki 25hp seems a good motor... at least a couple of forum members have them. Quite heavy at 62kg and to keep up the 5yr warranty dealer servicing needed.
The new Yamaha 25hp is lighter at 57kg but only a 2cyl.
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