I like to also step back and look at front end and see if its straight, if things like a rear wheel sticking out farther on one side over the other, as if in a roll over and bent something!
same with bars, are they pointing straight when tires are pointing straight!
inspect inside air filter, look for MUD, or if it is modified!, also just how clean or NOT the air filter is
folks that take care of things, tend to have cleaner air filters than those that don't!
check OIL, does it look brand new? if so, could be a warning
also smell oil> does it smell like fuel?
inspect battery area, see if any wires look damaged or modified! Mice like wire insulation and well, many folks THINK they know more about wiring things than they do! LOL
wheels , are they dented up rode hard , will bend them pretty easy if on stock wheels!
miles and hours, do the reading seem to match the condition of the atv??
or just if WAY high, are you up to doing motor work , as higher odds of a motor in need of something when hours and miles get WAY up there!
these would be some add on's to me!