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Yama 30 hp - missing at full trottle

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  • Yama 30 hp - missing at full trottle

    New kid on the block here
    I've got a 30hp outboard, tripple, oil injected. Don't even know the year, but the tag says 30 MSSHQ, serial # 6J8 S 106571.
    I have been having this problem were the motor will start missing when I hit full trottle? I have a spare upper unit from a outfitter, and have changed everything I can think of.
    switched the complete carb ass'y, fuel pump, oil unit, changed one coil at a time, CDI box, stater coil, kill switch, new plugs only help for so long then I usually faul one?
    The only thing that I can imagine is the carbs are dirty or need adjustments, as when I start the engine cold, it smokes pretty good - so its running rich correct?
    What puzzles me, is if I disconnect any one spark plug boot from the back and run it on 2 cylinders, then it runs fine?
    Guys keep in mind that this outboard sleeps outside year round, no garage.
    Has anybody ever heard of this kind of problem?

  • #2
    May have too small pitch prop on it, check rpm's at full throttle.
    Regards
    Boats.net
    Yamaha Outboard Parts

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    • #3
      How about the fuel line? Might be worth replacing as well. I'm having the same problem with my 50hp. i've already done just about everything except replace the cdi box. im going to probably do that tomorrow.

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