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8hp to 9.9hp is there much difference ?
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<blockquote data-quote="Boat2fast" data-source="post: 367166" data-attributes="member: 13358"><p>Easiest to upgrade to 15hp are 1990-and-up Johnson/Evinrude. The most rewarding are 1993-and-up...more displacement. All these engines have the more desirable exhaust parts. 1989 and earlier 9.9s need serious surgery and a 15hp donor engine. </p><p></p><p>If you want a 15hp Merc, you have to buy one. The 6hp, 8hp, and 9.9hp share common displacement but, the 15hp Merc has a bigger powerhead.</p></blockquote><p></p>
[QUOTE="Boat2fast, post: 367166, member: 13358"] Easiest to upgrade to 15hp are 1990-and-up Johnson/Evinrude. The most rewarding are 1993-and-up...more displacement. All these engines have the more desirable exhaust parts. 1989 and earlier 9.9s need serious surgery and a 15hp donor engine. If you want a 15hp Merc, you have to buy one. The 6hp, 8hp, and 9.9hp share common displacement but, the 15hp Merc has a bigger powerhead. [/QUOTE]
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8hp to 9.9hp is there much difference ?
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