Let me preface this by saying I have never owned a dirt bike before, only street bikes. I am looking to get my son a CRF50 for Christmas. I found a used one and talked the guy to 600. However he says it doesn't have title but will provide me a bill of sale. He stated many dirt bikes don't have them. Is this true? If so, is there any ownership documentation? Also, I am understanding that they need the yellow/green sticker to ride OHV trails? What documentation is needed to obtain this if there is no title?