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Help Needed. 1989 Johnson 25 hp converted to a 30/35 HP
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<blockquote data-quote="Crazyboat" data-source="post: 507483" data-attributes="member: 21552"><p>Pleading ignorance here, Is the 25 block the same block as the 35? Going back to the 70's OMC used a bigger block or at least greater displacement for the 35 vs the 25.</p><p></p><p>I just got this off of a google search: The <strong>25 hp motor is 30.5 cubes, where the 35 hp is 34.5 cubes</strong>, so you can't do a jetting or reed valve change to make ten hp.</p></blockquote><p></p>
[QUOTE="Crazyboat, post: 507483, member: 21552"] Pleading ignorance here, Is the 25 block the same block as the 35? Going back to the 70's OMC used a bigger block or at least greater displacement for the 35 vs the 25. I just got this off of a google search: The [B]25 hp motor is 30.5 cubes, where the 35 hp is 34.5 cubes[/B], so you can't do a jetting or reed valve change to make ten hp. [/QUOTE]
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Help Needed. 1989 Johnson 25 hp converted to a 30/35 HP
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