Pro Honda GN2 is the only oil that has been tested and approved by Honda R&D for use in all older liquid- cooled and air-cooled two-stroke Honda Motorcycles, ATVs and Scooters. Its unique, clean-burning formula reduces exhaust smoke, carbon buildup and varnish deposits, and helps prevent spark-plug fouling, ring sticking and exhaust plugging. GN2’s superior lubrication extends service life for piston rings and bearings, and helps prevent against rust and corrosion.