Reading some of the trheads has peaked my interest in putting a CDI unit form an ealrier model on my 2009 YZ405f. My bike has a jardine full exhaust with a 165 main and needle raised one clip position. I would like a bit more in the middle and on top. Which years will help out. can i use one from a YZF450 (4 wheeler), I would guess no, but???? What I have found so far is to use one off a 2006 Model year, but how a bout Model Years 04, 05, 06, 07, 08 or off a 4 wheeler? Can anyone help, I am sure someone knows!