Kohler K321 1-cyl gasoline Fuel typeGasolineCylinders1CoolingAir-cooledDisplacement512 cc 31.27 ciBore and stroke3.50 × 3.25 in (89 × 83 mm)Power14 hp (10.4 kW)Rated engine speed3600 rpmTorque23.8 lb-ft (32.3 Nm)Peak torque speed2200 rpmStarterelectricStarter voltage12 V air-cooled horizontal-shaft