I have a 2007 honda 400ex that has been sitting for about a few months without running. I recently rebuilt the carb and had it adjusted. Im experiencing a problem where it backfires only when it hits a certain rpm, but only in idle. When running through the gears and driving, it runs through the entire rpm range with no problems, no backfire or any hint of misfire. When it sits in neutral it also runs fine. Its only when I press the throttle it starts backfiring at a certain rpm. I took a video in case that might help. The backfires in the video are really quiet. They are actually REALLY loud bangs in person.
