Dayuri 18 Inch 4000W Gasoline Chain Saw 450Mm Da-Gcs5123. Rated Output Power: 4000W (4kW); Engine Type: Air Cooling Single Cylinder, Two Stroke; Displacement: 78cc; No-Load Speed: 3000Rpm; Max. Cutting Diameter: 450mm; Two-cycle Oil/Gasoline Mixing Ratio: 1:25; Fuel Tank Capacity: 550ml; Engine Oil Tank Capacity: 260ml; Guide Bar Length: 18″ (450mm)