converting a 8hp to a 10hp

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

  1. tru66stang

    tru66stang Well-Known Member

    8
    0
    326
    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

    3,675
    106
    2,268
    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 :)

    Dave
     

  3. Brett

    Brett > PRO STAFF <

    Parts diagram uses the same pages for multiple horsepowers.

    http://www.crowleymarine.com/mercury_parts/496.cfm

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

    Jacbo Well-Known Member

    200
    0
    391
    Mercury 2-stroke 6-8 hp: Displacement- 210cc
    http://www.defender.com/inflatables/outboard_project/mercury/mercury_2/merc_8.html

    Mercury 2-stroke 9.9-15: Displacement- 262cc
    http://www.defender.com/inflatables/outboard_project/mercury/mercury_2/merc_9_9.html

    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.