Penray’s Super-X 215 Bonus Size Heavy Duty Carburetor Cleaner is formulated to help restore carburetor performance by removing gum, varnish, carbon deposits and dirt build-up. It cleans and frees automatic chokes, carburetor linkage, fuel injection intake systems, manifold heat controls and the PCV smog valve and will help the engine start easily, idle smoothly and accelerate without stumbling.