My son has outgrown his KLX 110. He absolutely wants to stay with Kawi, so we are looking at KLX140's. He sat on some new ones (small wheel) and the fit is good. Anyway, I have a chance to buy a used '08 KLX140. Any major changes since '08 other than graphics? I have read about the loud squeal/noise that comes up on some bikes (trans/clutch?). Is it more common in certain years? That is the one issue which has me nervous about buying a KLX140. Anything else I need to look out for? His KLX110 has been bulletproof. Thanks!