I may replace them someday, but right now I just want to get it running well enough to enjoy it. I know everyone says you can't fix it with just a re-jet, but surely I can make it better, right? Lol. As far as I know the carbs are stock, and I have my mixture set as good as I can seem to get it, but I still get back fire when I decelerate. Thanks for the tip!Little hint....those little spool shaped 'needle jets' in the carburetor venturi tend to wear quickly and be problematic in these carburetors (the early 750 Honda used the same needle jets). If you just can't get them right, the carbs from a CB350 work perfectly on these things too. Nicel looking piece of work by the way...if you paln on repalcing those shorty mufflers with something that looks a little more 'correct', hold off on any carb work until you get them fitted.