I have recently been given a 4wheeler. I know it is a honda and believe it to be a rancher. all the markings are gone. how can i determine which model and size it is.

 

Post some pictures for us, or call a dealer with the VIN and have them run it.

It should also have a sticker on the front frame (near the VIN) that sould say a year and model...like TRX350FM or something like that, if it hasn't been removed.