the ws7 pic shows one
http://www.amainhobbies.com/product_...ducts_id/23023
s5 and s7 dont
http://www.amainhobbies.com/product_...ducts_id/23022
also carb info for s7
Carburetor: Slide Composite 8mm
and ws7
Carburetor: Slide Composite 9mm with removable Venturi 8mm
i dont think it was a mistake.....