As I was finishing my last ride I noticed oil on my left boot like several other people have on this board. The timing plug on my 04 YZ450 had backed itself almost all the way out and oil was seeping out. The real question I have is that when I removed the plug to inspect it there was no O-ring on it??? Others have posted here that there is an O-ring on this plug. Can anyone verify yes or no? My owners manual is who knows where. Thanks for any help.