Hey Guys, I just picked up an 01 YZ426 a few days ago. I'm having a few issues with it so far. The bike has a K&N intake and a Dr. D full exhaust. When the bike is running it makes loud popping noises and short flames come out of the exhaust. Usually the popping will go away for a bit but after riding some it comes back and the bike will get to the point where it wont idle on it's own anymore. I'm not really sure what the jetting is on it yet as I have not pulled apart the carb. I live in Arizona the elevation is just under 1300 ft and the average temperature here is about 80 to 90 degrees. Any suggestions on jetting or tuning would greatly be appreciated. Thanks!!