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  1. O

    How to set up high/low idle, and carb screws?

    I have been monkeying with the carb and idle screws for the last 2 weeks. They seem to be all interconnected but i cant seem to set them up properly. I have looked up the manual and gotten this info: inline 4cyl fuel 50:1 idle inforward gear 600-700 rpm full throttle 5000-5500 rpm spark ngk...
  2. O

    1993 40 hp merc. Can i over Rev it?

    First time boat owner, I just got a 40 hp 1993 merc and have been messing with the throttle screws. Is it possible to accidentally over rev the motor and damage it? Is using the tach on the dashboard in neutral a reasonable way to set the max rev? (manual says 5500 rpms max) or do i need a...
  3. O

    Where are sync carb screw holes and adjusters on 40 hp 2 stroke 1993 merc?

    4 Cyl, 2 carbs. I have seen other videos on people doin this on yamis but dont see similiar screws on my merc.
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