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1986 Yamaha 40 HP

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  • 1986 Yamaha 40 HP

    Enigine runs great until it warms up. (15-20 mins)Then it has a miss under a load. I have just changed the plugs, no help. Thanks for the help

  • #2
    Possible a ignition problem a coil or pulsor coil breaking down, have ign. tested

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