Just got this atv no stickers or brands on it. Tried looking up and decoding the vin I found on it but has came back invalid.

 

Try a few different vin decoders, and the tenth digit is the date, a number from 2001 to 2009 and a letter before and after that. Those pale grey trims are fairly distinctive. I would guess that only one maker will use them, so if you can find pictures of another quad with them, you will have nailed the make. Engine will be GY6 if it is a four stroke, or Minarelli if it is two stroke. Most Minarellis are circa 90cc, GY6s are mostly 150cc, though both come in different capacities too. With a bike as tidy as that, you shouldn't need frame or plastic spares, so the maker is not that important. Engines are generic, and generic electrical parts are available for them.