Re: 1958 35hp OMC drops one cylinder at low throttle

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September 2, 2017 at 7:36 pm #64189
chris-p
Participant

    Unfortunately, your spark test does not do anything. When the plug is in the cylinder, it is under compression, and it is MUCH harder to provide a spark under compression. A weak ignition system can make spark jump the plug gap with ease. Doesn’t mean it will do it when installed in cylinder. I would guess you have original coils in there. You will know, they will be cracked. Or, failed condenser.