All the Weber carbs. we sell are the genuine article – we don’t sell any that are made in China or the US. We get ‘phone calls every week from people who have bought the Chinese copies (sometimes sold as genuine Weber carbs.) who have problems getting them to run. The complete carburettor kits we sell are jetted to suit individual engines – you probably won’t get this anywhere else! We have found that the standard settings everyone else use aren’t much use… If you have specific jets you would like fitted, please contact us before ordering to discuss requirements.