When I first got my bike it started running poorly. I removed the tank to check the plugs and found two loose plug wires. I pushed them in and things were better for half a ride and went down hill again. When I pulled the tank one of the wires was off again. I pushed it on, reset the tank and started the bike. In about 1 minute I heard a distinctive "Pop" sound. I pulled the tank back just far enough to see the plug wires and #4 had popped out. I pushed it in and tried again without resetting the tank. I was able to watch the wire pop off.

I decided to replace the plugs and make sure I had a good seat. It seems to have worked, but now any time the bike doesn't seem 100% I worry that the wires have come off. Has anyone else seen this problem? How did you solve it?