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1980's Johnson/Evinrude 20/25hp conversion to 30hp with pics
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<blockquote data-quote="durco" data-source="post: 462290" data-attributes="member: 24419"><p>The 9.9 to 15 is the only true swap with just the carburetor change. On the 25-30-35 there is a crankcase change, to wit: the 20, 25 and some 30's have "finger" ports on the chamber intake ports. 35's have "bridge" ports. True 35's will have maybe a little rougher idle and a rougher transition (from low rpm carb circuit to high carb circuit) than a jacked up 20, 25 or 30. Not saying you won't gain from the intake and carb swap; you just won't quite get the full "monty" with it.</p></blockquote><p></p>
[QUOTE="durco, post: 462290, member: 24419"] The 9.9 to 15 is the only true swap with just the carburetor change. On the 25-30-35 there is a crankcase change, to wit: the 20, 25 and some 30's have "finger" ports on the chamber intake ports. 35's have "bridge" ports. True 35's will have maybe a little rougher idle and a rougher transition (from low rpm carb circuit to high carb circuit) than a jacked up 20, 25 or 30. Not saying you won't gain from the intake and carb swap; you just won't quite get the full "monty" with it. [/QUOTE]
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1980's Johnson/Evinrude 20/25hp conversion to 30hp with pics
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