Thats rite, my 2002 plated e with about 2,500 hard miles on it just started making a pretty nasty crunching noise in the top end while breaking in a new motorcross track. If I had to pinpoint where the sound was coming from I'd have to say the left side of the bike. It's not a constant sound, does not have a rhythm to it or any thing like that, but it be heard every 10 or 20 seconds at idle. It almost sounds like a rattle or when our motors shut off and take that half turn backwards. I already checked the stator to see if the bolts had backed out, but that whole area was tidy as when I did the loctite fixs. Valves where checked and in spec 500 vicious miles ago, oil changed to 15-40 ester based oil about 70 HARD offroad miles ago. I still have the ACCT so I'm not ruling that out, other than that the only other thing I can think to check is the starter...The bike is running amazing rite now and the sound cannot be heard nor felt while riding it. I'm stumped and trying not to chew my greasy nails rite now, someone splease shed some light on me.