There is a used "XR500" at the dealer that I am looking at. They have it marked as an 86 but the sales guys said based on VIN it is a 87. Well after some reasearch I don't think it is an XR500 but a XR600 due to year and how the side plastics clip on. It does have a XR500 seat on it, but that could have just been a cheap repleacement. Are there some things to look for to confirm what the bike is or isn't. It has a white frame and white plastics. Motor is painted black, side plastics have the metal twist locks. Front disk brake, rear drum. Any ideas.