Reply To: Mercury force 120 misfiring pics of spark plugs

[Don]

Not familiar with how the Force powerheads go together.  But, those damn surface gap plugs often look like crap even when they are firing ok.  OK, so you just put the powerhead back together, did it ever run right after assembly?  Does it idle OK and just lacks WOT power?  Or, does it run like crap at all speeds?

I’m keying in on your comments about “misfiring like crazy”.   Are you sure you have the plug wiring/switch box wiring/timing correct?  I would recheck all the ignition wiring.  Sorry, wish I had more knowledge about these, but don’t…