(TWIN HS4 1½” SU Carburettors. Carburettor JET FEED PIPE. (Carburettor Jet to Float Chamber - Jets NOT included). (JET & FEEDPIPE. 1) - BRASS Nut - AUD2129 x 2. 4) - BRASS Insert - AUD2195 x 2. If you do fill up with E10, dilute with E5 as soon as possible.