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  1. S

    2 stroke 3 cyl HP ratings

    I see the 60, 75 and 90 all share the same bore / stroke, so I'm curious about what is limiting the hp in the 60 and 75 hp engines? Is it strictly carb size, or also port timing? Is the 75 just a 90 with smaller carbs and less ignition advance? TIA, Steve
  2. S

    Merc 90 2 stroke specific carb questions

    Hi all, new to boats and this forum. Not new to engines and tuning. No 2 stroke experience. Quick learner though. Very good with carburetion. This is my first boat, I'm the second owner, and I'm undoing all the jacked up work from the previous owner, and learning all the way. Specifics: 17"...
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