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1994 Yamaha 50 HP

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  • 1994 Yamaha 50 HP

    I have a problem with 1994 Yamaha 50 HP, (50DMO).
    it doesn't run on all cylinders.
    i have put new spark plugs in it.
    drained and cleaned the carbs.
    even swopped the coils around.

    it still only runs on the top 2 cylinders.
    i have been told that it could be the CDI unit.
    what else could the problem be?
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