Hey my buddy just pick up a xr600r the other day and Im going to do a oil change for him on it. The thing is, we do not know the year. Im guesing around 1988 and up. When did they change the xr600 so that the amount of oil you have is differnt. I was wondering how much oil do I need to put in with an oil and oil filter change. The bike did not come with a manual so I do not know the specs. Also if someone could tell me what to gap a new spark plug that would be great as the guy he bought the bike from said he never changed the spark plug. Thanks for any help.