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Yamaha 115hp Misfiring

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  • Yamaha 115hp Misfiring

    Hi

    I have a 115 v4 2 stoke motor that misfires when under load.
    it starts fine and idles fine and revs fine without a load. the moment I am on the river and try and accelerate it looses power and misfires.

    What would cause the engine to misfire only under load?

    I have changed the plugs.
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