I sold my Ninja 636 about 4 years ago because I got tired of having a sore back after riding. Last fall I started getting the bug to get another bike. I brushed it off for winter, but as soon as spring got here, I got the bug again. I find myself searching classifieds all the time. Anyone who found them in the same situation as me, and did buy another bike, please respond. Did you ride your bike more the second time around? Did your regret buying another bike after the first year? If I get another bike, I am going to get something more comfortable this time.