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Brad=> The right hand pipe is still backfiring. As I often do, I have to first clarify that what you're getting is postignition (unburned fuel igniting in the exhaust -- small pop) rather than backfire (fire in the cylinder coming up through the carb -- big, scary explosion). Postignition is not unusual, and often points to an exhaust leak. Fuel in the exhaust can indicate that the mixture is rich, spark timing is off, or a valve isn't set right. So yes, it could be a carb problem, but I agree it's not likely to be the cutoff valve.