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Join Date: Jul 2006
Location: Kennett Square, PA
For the air adjust screws, in is lean, out is rich - the factory setting is 1 5/8s, but Fergy's right, that that shouldn't be the source of your backfiring while running. If it's just the left side, check for any loose bolts on the left side exhaust - Chad, I think, noted that an exhaust leak will cause backfiring, and that's the easiest place to start. I'm trying to think, though, if you pulled the emissions stuff, the hoses must've been pulled off of the reed valve covers (the reed valves introduce fresh air into the exhaust to burn off any unburnt fuel), and the rear vacuum port. And there's a hose coming out of the airbox that hooks into the emissions set-up,too. Jon Landau, are you out there??? Did you coaster or marble the reed valves after you shaved? And how did you handle the rear port?
Also, while it's theoretically possible to check your jets with the carbs on the bike, I don't think it's practical. There's just no space in there to work, really.