Usta be 8 hp shared a block with a twin 6 hp Yamaha....

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In Response To: I have heard of changing a 9.9 to 15.....but not sure it works the same for an 8hp ()

That was changed several years ago but I think all the newer ones of most ilks share the same block with 9.9 but not necessarily the 15 hp. But I been wrong before...

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I bumped up the horse power of my 8 Hp Nissan outboard
- I have heard of changing a 9.9 to 15.....but not sure it works the same for an 8hp
  - Usta be 8 hp shared a block with a twin 6 hp Yamaha....
  - The Yamaha 6hp
    - It's pretty tired but not tired enough to
    - I thought the newer Yamaha sixes four strokes were single cylinder.
      - I think the ones we are talking about
        
        Ah, thanks. I'm so easily confused and don't get "out" much.
- I have a twenty-five year old Mercury 2 cycle, 4 HP -- would it work for that to boost it?

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