I'm looking for help with my 02 WR426.My bike has about 450 miles on it. About the last 150 miles or so, I started to notice a crackling exhaust sound (like a small backfire). At the same time I have been loosing power,and throttle response. If I crack the throttle quick at a idle it will usally fall on its face. I live in Michigan, the temp.here is about 75 degrees the humidity is about 60-70%. My carb settings are mj 160, I raised the needle clip 1, pilot 42, pilot adj. 1 5/8. My mods are air snorkel removed,FMF Q silencer,and cut the throttle stop. I just did a plug check and it was black with a white tip on the electrode.