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Discussion in 'Outboard Maintenance' started by tru66stang, Feb 21, 2010.
is it possible to convert 8hp to a 10hp or bigger its a 90ish mercury looking for any input thanks.
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
Parts diagram uses the same pages for multiple horsepowers.
You'll need to compare carbs, reed housings, exhaust covers and lower units.
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.