Don't think so...Never had a backfire...the older carbs would blow out power valves on a backfire, the newer ones have a check ball that is supposed to prevent that from happening still could though I suppose. Could have some debris causing it to not fully seat but the fuel tank, filters and lines are all new, about ten months old. Fuel filters have been changed 5 times already, not because of problems but because it's a new installation. I only change the fuel filters now at oil changes.(2500 miles)