I was riding my 2005 RM125 dirt bike the other day when it bogged down all of a sudden. I noticed the spark plug had backed out of the head, thus causing the stall. I pulled the spark plug all the way out and realized that the small bottom piece of the plug was missing.
Evidently it had broken off inside the cylinder. I got the bike home and fished around in the spark plug hole with a magnet to try and retrieve the piece, but I couldn't find it. I even took the head off and fished around some more. I'm about to give up. Is it safe to crank the bike without making sure I find the little piece, or should I make sure and find it before riding again? I just don't want it to cause serious damage inside the engine.