The last two short rides on my 01 WR 426 I got alot of sputter at about half throttle in any gear. Much more pronounced than when the grey wire was connected. If I gave it more gas it would go away. I changed the plug at about 100 miles and it was a little brown. The bike has about 600 miles on it now and the plug was full of carbon along w/some carbon in the head pipe. The air box lid is removed and I have a YZ throttle stop in. I have a Baja Designs exhaust baffle. It has always started on the second kick and if I dumped it w/the hot start it would start on the first kick. So I have never made any jetting changes. I cleaned the carb and raised the needle two clips. My thought was that it has been running a little rich and the plug was starting to foul. It is in the basement for the winter so I will not be testing the jetting change until spring time. I have rode it when it was colder out then now and it ran fine. I am wondering if I am heading in the right direction for the fix.