Reading the pressure tester thread reminded me of something weird that happened on my 03 KX250 the other day. After washing the bike I warmed it up to change the oil and while I was draining the oil I could hear air coming out of somewhere that turned out to be one of the bolt holes on my stator cover????? Why would pressure build up in there? Or could this be an air leak from the seal? The bike does seem to be pinging sometimes but not bogging at all. The only thing I've changed is to move the clip up one position, other wise the bike only has maybe 30-40 hours total? Any ideas?