I am very new to this sport and have a couple of questions regarding registration. So I got a used pit bike of craigslist. All I have is a written bill of sale between me and the seller. Apparently the bike was never registered. What do I need to bring to DMV to register the bike? I know some tracks require red or green stickers. The bike I have has neither. How do I get these stickers, and what do they mean? Thanks everyone for your help.