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how do you turn a 25 johnson to a 30 or 35? Is it just the carb, or is it more involved like reeds, timing, ignition etc?
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Musky I have the same question and would love to hear what the  OMC guru's have to say about it. With the limited hp ratings on aluminum boats nowadays, I need all the speed I can get out of my 25 johnson. just wondering how the motor will hold up in the long run after adding the higher rpm's. Thanks, Randy

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Hello in some cases larger jets will help but most will need different ports in block to increase hp

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