I thought that all the free mods had been done to my 2000 WR400 when I got it. The stop was cut, the airbox was de-baffled and the lid was gone. Last night I discovered the gray wire was still hooked up. I pulled the wire and taped it back. Today while riding (untill I crashed) I noticed MUCH less popping and missing. Didn't notice it being and stronger, just smoother. Just thought I'd share.