Rzr newb looking for purchasig advise…

1st post here guys, just recently got the urge to buy a used Rzr and stumbled on this site which looks like its gona be tons of help.
Anyway. I wemt and looked at a 08 800efi last wknd but the guy was a young farmer who claimed to only mid it. The unit was not mint at all but had only 1200 miles and about 100 hours homemade doors and a clutch kit. He sayd he rebuilt the top end of the motor once already too. So I was ify about that one so going to look at a 2011 800 with a few more accessories this morning. Just wondering what and how I cam check it over instead of test drivong and goin with my gut which I usually tend to do anyway. Im no mechanic but I temd to diy as much as possible on my trucks and whatever else I can so Im sure I can figire these things out eventualy to.