Reply To: Mercury force 120 misfiring pics of spark plugs

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June 5, 2024 at 4:46 pm #288130
Don
Participant

    US Member

    OK, so the ignition wiring was mixed up??   I think I understand what you swapped out, but not sure if you still have the electronics for the other engine.  Sure hope so.  “misses at high speed”, seems like you are describing some sort of ignition miss.

    Again, not familiar with the force engines.  But, I do know that certain model OMCs will run like crap if you install “non inducter plugs”.   So, you might want to start with a set of the correct new plugs.