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F115 Running rough

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  • F115 Running rough

    Runs rough like it is starving for fuel. I checked and cleaned 3 filters before the high pressure pump. I get 42 psi on the fuel manifold which does not very much with rpm. Should the pressure go up or down with rpm? The plugs look good.

  • #2
    Usually about 38 lbs at wot.
    Regards
    Boats.net
    Yamaha Outboard Parts

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