Special note about carburators: ( THEY ARE NON-RETURNABLE ) We sell only 100% brand-new carburators manufactured by Brosal, Empi, Weber, and Solex. Every carburator we sell has been pre-tested by each manufacture and given 100% perfect condition stamp of approval. When considering the purchase of a new carburator, please be advised that WE CANNOT RETURN ANY CARBURATOR for any reason. A lot of performance related problems with hesitation, lack of power can be an issue with other systems on your engine. Please check thoroughly the condition of all engine components before ordering a new carburator. Before installing a new carburator, please insure that the fuel lines and gas tank have been thoroughly cleaned and flushed of all dirt and rust. Also, always replace all rubber fuel hoses and filters. It is your responsibility to guarantee the cleanliness of your fuel system. This is the only reason you will ever have a problem with a new carburator. If you need technical assistance concerning the tuning and adjustments of your new carburator that you purchased from us, Please contact our tech support line that is open 9:00am-5:30pm Mon-Fri. or leave a message, to assist you 1-888-SEL-BUGS.