Is there supposed to be a o-ring because i dont have one? any suggestions

http://www.400greybike.com/docs.htmdemerdzhiev wrote:hey guys when i give the bike a good warm up the oil cap starts leaking
Is there supposed to be a o-ring because i dont have one? any suggestions
xivlia wrote:i dont go fast on this bike so really do not need a rear brake.. /
vic-vtrvfr wrote:Ask xivlia for help, he's tackled just about every problem u could think of...