pro shed alamosa
It's likely to be at least 50% heavier at a guess. Usually the 6 and 8 hp models shared a block and the 10 and 15hp ones used the next size up. 8hp was manageable to lift on and off, but I doubt 15 would be so, at least not on a regular basis (I did once lift a 60hp ELPTO Mariner on and off by hand, but that's not something I would repeat voluntarily). 14' Hewescraft 15hp Johnson.