So I did an oil change. Had to do the old stab a screwdriver through the oil filter to get it off. Anyway all went well. Topped it up to the line. Changed the clutch cable while I was at it cause it was down to the last few threads. Took it for a run this morning. All seemed good and well. It started playing up a bit when I got back and it wasn't firing properly. Checked the oil and it was now way over filled (over the looking glass ). Just wanted to know what damage I may have caused? I'm pretty sure the plugs would be EFFED now right?