mgrossbauer
New member
What the heck happened to the center electrode on the first plug? I installed 4 new plugs on my 1989 US Marine Force 125. Ran it for about 15 minutes troubleshooting some things and setting the timing. Pulled the plugs due to rough idle and a miss, found two were good, two looked like the top plug. Any thoughts on where this electrode went and why? These are NGK BUHX surface gap plugs.
