S&S Super E Carburetor The Super E are butterfly type carbs with fully adjustable idle mixture screws ann changeable intermediate and main jets. The idle mixture screw is positioned and angled for easy accessibility. Even with 5 gallon gas tanks, adjustments are not a problem The Super E has a 1-7/8in. (47.6mm) throat at the butterfly and is identified by an E cast into the throttle linkage side of the carb body below the cast in wording S&S SUPER All Super series carburetors use a special enrichment device instead of a choke for starting.