I Know my bike is cold natured, but something is not right. Recently started poping and sputtering for the first 10 minutes of riding. I already warm the motor up for a few minutes before hiting the woods. Once the motor gets hotter it runs fine. I never had this problem until a few weeks ago. I took the carb apart and found no dirt or anything clogged, the float measured in corect at 9mm. I checked the valves 2 months ago and all was in spec. I have the WR carb gutted to YZ specs. I dont think I should change any jetting because the motor ran fine for 3 years with the jetting I have. I tried cr9e and have always run the cr8e. Same popping Should I hook the grey wire back up? Could it be muffler packing???? If anybody has had the same problem Please advise me of the cure.