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1990 225 yamaha two dead cylinders???

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  • 1990 225 yamaha two dead cylinders???

    225ETLD
    i have a 1990 225hp yamaha v6, when i pull the spark plug wires off of the top two cylinders the engine doesnt change its sound so im assuming they are dead (powerless) cylinders. i have cleaned the carbs, replaced spark pluggs, hooked up fresh fuel, its getting spark to the plugs, they have good compressing 110 on each... what else could it be??

  • #2
    Re: 1990 225 yamaha two dead cylinders???

    i just bought the motor and dont know any of the history, it runs great when on the muffs but has little power when underload

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    • #3
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      Re: 1990 225 yamaha two dead cylinders???

      good compression and spark on all cylinders would leave you with a fuel/air ratio problem.
      Carbs, reeds, or vacuum leak , but do not see vacuum leak on 2 cylinders very likely,
      any way that would be my thoughts

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