Gizmo Supply 52CC Gas Jack Hammer Engine Type: 44MM, Single Cylinder, Two Stroke, Air Cooled Fuel Mixture Ratio: 25:1 (gasoline 25, two-stroke engine oil 1) Max Power and Speed: 1.8KW/6500r/min Max Torque and Speed: 3.5N.m/5000r/min Impact Rate: 700-1500r/min