Ok its down to the wire. I recently visited my local Yamaha dealer in hopes of finding a few different jets for my carb as I had just fitted my 06 WR 450 with a new FMF Factory 4.1 pipe and was trying to get it running a little bit better. My dealer informed me that he had no jets for a Keihn carb, but told me to talk to one of his mechanics to see if he had any. After a lengthy conversation the mechanic told me my problem was that I had disconnected the grey wire, and that it would make it run like crap. I tried to disagree with him but he then told me that the grey wire mod would work on American WR's but not the Canadian version. Can someone tell if this is right or not, and if possible give me an idea of where my carb should be set (jetting wise)? I've done all the free mods plus the FMF pipe.(stock filter) I am also at about 800-1000 feet asl.