converting a 8hp to a 10hp

Discussion in 'Outboard Maintenance' started by tru66stang, Feb 21, 2010.

  1. tru66stang

    tru66stang Well-Known Member

    is it possible to convert 8hp to a 10hp or bigger its a 90ish mercury looking for any input thanks.
  2. noeettica

    noeettica Well-Known Member

    Welcome [smiley=1-beer-german.gif]

    If it's the same displacement as the bigger motor it may be possible :)

    Carb change reed plate etc ... Brett should be along any time :)


  3. Brett

    Brett > PRO STAFF <

    Parts diagram uses the same pages for multiple horsepowers.

    You'll need to compare carbs, reed housings, exhaust covers and lower units.
  4. Jacbo

    Jacbo Well-Known Member

    Mercury 2-stroke 6-8 hp: Displacement- 210cc

    Mercury 2-stroke 9.9-15: Displacement- 262cc

    So no, there's no way to get 9.9 or 15hp out of your powerhead. Although if you can find a 9.9/15 powerhead cheap enough it should bolt right up.
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