Same bike...now at 45,000+ km. Carb rebuilt last summer, for no real reason other than to replace the needle that I thought would be well worn by now - it wasn't!update , still have the same bike, 03 ktm 640A, will be 10 yrs old August since I bought new.... I gave her an engine rebuild at 127k as outlined in this thread: http://advrider.com/forums/showthread.php?t=632893. The bike has been super reliable for another long span and now has close to 178,000 km on it... My plan is to run it up to 200K and do the rings and a valve job....
Nothing but Mobil T 10W-40 synthetic.