I am looking at buying a 1999 XR650L. It has 28,000 mi. however it appears to well taken care of. The top end of the engine has been re-done once and I expect it it will have to be done again using 15,000 mi. as a guideline. What other major items should I put on the potential "TO DO" list if I were to purchase a bike of this vintage? Any guidance would be much appreciated.