Hi, i have a cr 250 1998 and im wanting to get a new chain for it and i dont know how many links am i supposed to get and also on my pipe it is stock and where the little rubber thing that connects the pipe with the silencer i think that is leaking but im not sure because it sprays exuast all over my bike and when ever i ride my bike and i titan my chain my chain loosens after that ride and i titen the tensoners and everything if i could get any help i would be thankfull...