Catalog › Bing 54 Carburetor Sockets for Rotax 503 Engine Image 1 of 1 Bing 54 Carburetor Sockets for Rotax 503 Engine $72.95 Set of two- carb sockets for Rotax 503, also fits our Kawasaki 440 carbs. Add To Cart Added! Set of two- carb sockets for Rotax 503, also fits our Kawasaki 440 carbs. You Might Also Like Fuel Primer Bulb $26.95 Air Filter for Bing 54 Carb $58.99 Amsoil Gear Lube $24.19 1/4" x 1/8" Brass Primer T $7.95 Air Filter for Bing 54 Carb $63.99