The main thing is maintenence and the owner. I have seen bikes with 10 hours on then that are completely hammered to bikes with hundreds of hours that have been maintained well that are as tight as new This goes for just about any used bike, but these are a few things I look for when buying a used bike... Check the swingarm pivot to see if it frozen, and the steering head for tighness and smooth operation. Lift up and the back of the bike to see if there is slop in the linkage. Look at the rims for straightness, trueness, and scratches. Check the wheel bearings by grabbing the wheels and moving left to right. Cold start only. If a seller "Get's her warmed up for you," you can just about assume that it will be hard to start or smokes when cold. Has anything been repainted? What has been replaced from Stock/Original? Does the bike have the original plastic on it? OEM plastic will have the Honda part numbers embossed into it on the backside of the number plates and fenders. Replacement plastic will generally say "Made in Italy" underneath. What does the bottom of the frame look like? Is all the paint worn off and dented or is it clean? Look at the fork legs. Are they scratched and dented or clean? Look in the airbox, what is in there? Dirt, Sand, a dirty filter, filter installed backwards or not installed properly? It will go a long way in telling you how the bike has been maintained. Look for the original hardware on the bike. If a lot of the hardware has been replaced, something is going on. If things have been modified, who did the modifications and how were they installed. Some people should never be left alone "improve" a motorcycle due to their lack of mechanical skill. If the stock items have been replaced, does the owner have the original parts?