Hi, I'm new to the Kawasaki scene and I just picked up a 2006 636 and was just wondering what kind of common issues do these bike have. I have owned 2 CBR600RR back in the days and just now getting back on and riding again after 2 years. Here is a little history on the bike. Its a 06 636 with 9,500. It has a Yoshimura RS-5 slip-on that has been shorten 4" and a K&N air filter, besides that the bike is all stock from my knowledge.