Ok guys. I went to Haspin Acres today. Up until now, the bike would idle perfectly. I rode it yesterday to make sure everything was ok. It idled and ran perfectly. I get to Haspin, fire it up, it idles perfectly. I put around the track one time, then hit the drag strip. It ran through the gears good, but as I started to decel, it popped and backfired pretty bad then died. It normally would only pop lightly once in a rare while. It would start back up, but in order to make it idle, I had to pull the choke out a little, or open the throttle slightly. When I say open the throttle, I mean just a slight, slight crack. If I closed the throttle, she would idle rough, then die. I tried to raise the idle, but that didn't really help. I was able to ride the rest of the day, as 99% of the rest of the throttle was "normal", it would run strong and pull great. But if I closed the throttle all the way, boom, she would die. On decel at the track, if the throttle was closed all the way, it would pop something fierce. If I decel with the throttle open 0.5%, it would not pop. So, one moment it idled great. Very next moment it would not. Other than that the bike felt normal. Is there an idle circuit? I would think if the pilot got plugged it would be more than idle. What else could cause an instant idle problem? Again, I did not notice any, any other difference other than the idle. Thanks guys!