I just recently purchased a 2003 KDX220, and I love it! I am unsure of the history of it, it was a trade in at a local dealer, and they were selling it "as is". I have only been able to ride it a couple of times, and I am a noob when it comes to what a 2 stroke is supposed to sound like through the range of it's powerband. I noticed, to me, what sounds like a clicking noise in the top end when I am either slowly accelerating, or cruising at a constant speed. Any thoughts on what this could be, and how to fix it? Or is this normal? Thanks.