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The weight for the Mercury 150 Fourstroke 25" shaft is in the engine brochure on Mercury's website. Click on the "Brochure" link at the bottom of this page:

https://www.mercurymarine.com/en/us/e...ifications

If anyone has difficulty navigating to that brochure, here is a direct link to the brochure:

https://mercurymarine-gsdesign1.netdn...ochure.pdf

I didn't see where the original poster specified any given Yamaha model other than what he has already. I posted the weight info for the Yamaha 150 25" shafts because I could not seem to find Yamaha's weight spec for the 25" shaft version of their F200. Given they are the same displacement, the weight of the F200 should be the same or very close to the F150 weight.

EDIT: But looking again, I see the F200 is actually a bit heavier (+7 lbs) in the 20" version than the F150, so likely a bit heavier in 25" shaft as well. The F200 has more displacement as well. That is a lot of extra power for very little weight gain.