Hello, I am writing this because on my 2009 yz450f I just replaced the cdi to a 2006 cdi as an upgrade. When I got the 06 cdi it didnt come with a yellow plastic insert that fits between the electrical prongs. Now I put yellow insert in from my 2009 cdi into the 2006 cdi and put it into my bike. The bike wouldnt even run past idle. I thought this was weird, I took the yellow plastic insert out and the bike runs fine now. However im wondering if this piece is important and should be in there or not. Does anybody know?