I know many a thread has been written about the "popping", and many answers have been given. I too suffer. My issue is so intermittent it is driving me crazy. At idle it may not do it for 15-20 seconds, then do it for 5 seconds straight. At 1500 - 3000 rpm same issue. I rebuilt the carbs less than 2K miles ago and recently resynched them. It has the Jardine exhaust w/ crossover. I removed the air cleaner to expose the plenum. With the bike on the center stand it pops through both exhausts but not through the carbs. Could it be detonation? Many thanks.