A few year back, I was at a National Hare & Hound, and about 5 PM heard a knock on the trailer door. It seems that one of the racers had his KX500 rebuilt the week before the event and the power valve was timed wrong. By the time they knocked on my door, they had been working on getting the timing right for about 5 hours. As I followed the messenger to site of the carnage, I found that there were probably 40 folks offering all kinds of advise on how to time the power valve. I think at that moment, I could have purchased myself a KX500 pretty cheap, as everyone was pretty frustrated. Even after I arrived, they continued to offer advice, to which I said nothing, but simply went to work properly timing the valve. Took about 5 minutes. Once you get used to how the thing works, it should be a snap for future cleanings.
Enjoy
Rick