Valves can get hit with the piston if it jumps time. If it's fixed it's fixed though, wouldn't be any lasting effects. These machines are pretty tough, just look for the usual stuff, leaks, ripped boots, check the oil, check the diffs if you want, check for play in wheel bearings, rod ends, ball joints??, swingarm bearings etc. Check the air filter, that's usually a decent indicator of how the machine has been treated, look for signs of water/mud getting in the airbox.
Title is a bit sketchy, depends on where the machine is as some states don't require titles on ATV's. Up here everything has to have a title to register it to use on the trails so anything with no title you might as well cut the value in half. You can always check the VIN online, so make sure you know where to look for that, or have the owner provide it for you before going to look at it. There is a few different sites to look up VIN's.
Title is a bit sketchy, depends on where the machine is as some states don't require titles on ATV's. Up here everything has to have a title to register it to use on the trails so anything with no title you might as well cut the value in half. You can always check the VIN online, so make sure you know where to look for that, or have the owner provide it for you before going to look at it. There is a few different sites to look up VIN's.
