CNG Engines   Air Cool Engine 110 cc (White cover) with reveres gear Air Cooled 110 cc (Black cover) with reveres gear Air Cooled 125 cc (Black cover) Air Cooled 125 cc (White cover) Air Cooled Water Cool Engine 150cc: Water Cooled, 4-Stroke Engine 175cc: Water Cooled, 4-Stroke Engine 200cc: Water Cooled, 4-Stroke Engine 250cc: Water Cooled, 4-Stroke Engine 650cc: Water Cooled, 4-Stroke Engine 800cc: Water Cooled, 4-Stroke Engine