Single cylinder, forced air cooling,4-stroke gasoline engine Model: GX390 13hp Displacement: 389 (cc) Bore Stroke: 88mm 64mm Rated Power Output: 10.0HP (7.35)KW / 3600rpm Max. Power Output : 13.0HP (9.6)KW / 3600rpm Torque (N.M): 23 / 2500 Compression Ratio: 8.0 : 1 Fuel Tank Capacity: 6.5 (L) Engine Oil Capacity: 1.1 (L) Engine Type: Forced Air-Cooled, 4 Stroke, Single Cylinder Ignition System: Transistor Magneto Starting System: Recoil Start N.W. / G.W. (KG): 31 / 33 Dimension (LWH): 490 430 510 20FT (set): 236