well as far as I know all the honda's with tubed rear axles like this has, the left wheel bearinga dn seals werew all weak links, the seal goes, allowing water in and that ends up killing the splines on the rear axle\ its a easy deal to replace and go new, like 25 bucks, and easy ti install as well
way cheaper than a 200 buck axle, thats for sure, as I found this out the hard way, I now keep close eye on mine LOL
other wise its all the basic's of checking over a used atv, all wheel bearings are prone to wear, and at this age, there something I would look at
next would be oil, is it CLEAN new looking or?? if dark it says NO recent oil change was done, which to me when looking at a used atv is a good thing, as older oil will show signs of water in it if its been run in deep water
same would be for diff.'s, but harder to inspect. when most sellers go to sell, they tend to replace these things to cover up any issue's at times??
I recommend re changing when you get it , so you know its done right!
next will be look for obvious signs of crash damage, bent parts, racks, handle bars levers, fresh paint to cover things up
inspect the air filter, a good owner keeps it clean and oiled, a some what lazy on PM's owner, it will be rather dirty and dry IMO!
do hours and miles seem right to you?? are wheel bent up at all, that tends to show an aggressive rider been running it!
its looks like a clean atv in the pic's but its always hard to tell real conditions from a picture