welcome to the site and congrats on the ewn to you atv
best of luck with it
best advice I can give when buying a used atv is, change ALL fluids and spark plug, make sure air filters is good and clean/spark plug too, try and set atv up KNOWING all things are good as possible
and then do PMs as needed an NOT just by hours or miles or months! meaning if you run atv HARD, work it HARD, change oil/filter sooner, ride in dusty places, clean air filter sooner/more often! and so on
waiting till the hours or miles add up, might be way longer than things stay good IMO
take care of things better and they tend to last longer, not rocket science, or real hard!
yet many don;'t do it!