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  1. D

    No Spark shows on running outboard

    I suspect one cylinder not firing. My question is why does spark tester show no spark on a running engine?
  2. D

    No Spark shows on running outboard

    2009 Mercury 90 Hp 2 stroke ELPTO Will not get above 4200 RPM and not getting expected high end speed/power, and has a rough idle. Trying to check for spark, I used an in-line spark tester. I can not see spark on any of the 3 spark plug wires. I thought the outdoor light was too bright but I...
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