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    1989 Yamaha Pro50 cylinder out?

    Just put boat back in water... runs fine day 1, but on the way home, konks out down to 2400rpm for last few miles of trip. day 2 runs fine after I replaced #3 (bottom) plug. put on new fuel tank, and added 89 octane at end of day (usually use 93). day 3, get out 1.5 miles, just past no wake...
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