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    1974 Evinrude 9.9 Plug Fouls

    I run full speed, but after a few times trolling, I seem to loose full throttle when I am heading in. The boat won't come up on plane and every once in a while the motor will act like it gets more RPMS and then bog back down. I pulled plugs and one seems to be fouled up. Any ideas? I use 50:1...
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