How can you tell what year bike a cdi is from. My buddies friend is trying to sell me a cdi from a 06 450 but I'm not sure if it is or not? I have a 09 and want the 06 cdi but this guy is so full of @#$% I don't really trust him. It has 2S2-00 on it. I looked up the new parts on a microfiche but did not see anything that stood out to me. Help please.