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1989 20 HP Johnson power upgraded to 25 HP for zero dollars
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<blockquote data-quote="Stefan" data-source="post: 343376" data-attributes="member: 7352"><p>Hey,</p><p></p><p>It depends on the model, year and size of the motor. In my case, the 20 hp was = to the 25, 30 and 35 hp of that vintage. the only difference was the intake manifold and carb for the 30 and 35hp, and for the 25 hp model the only difference was the intake manifold. </p><p></p><p>I didnt have to do any further modifications to the engine to get the increased power. </p><p></p><p>Again, do your homework on the specific motor you would be modding. Luckily for me , my engine shared a powerhead and gearing with many different motors.</p></blockquote><p></p>
[QUOTE="Stefan, post: 343376, member: 7352"] Hey, It depends on the model, year and size of the motor. In my case, the 20 hp was = to the 25, 30 and 35 hp of that vintage. the only difference was the intake manifold and carb for the 30 and 35hp, and for the 25 hp model the only difference was the intake manifold. I didnt have to do any further modifications to the engine to get the increased power. Again, do your homework on the specific motor you would be modding. Luckily for me , my engine shared a powerhead and gearing with many different motors. [/QUOTE]
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1989 20 HP Johnson power upgraded to 25 HP for zero dollars
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