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  1. W

    2004 yamaha 9.9 bogging down when increase throttle.

    I have a 2004 yamaha 9.9 that has started to bog down when I add throttle to the motor. Changed the fuel line and fuel bulb and put new plugs in motor. Plugs looked black with soot and looked like motor may be running rich. Checked compression and both cylinders show 110 pressure.
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