NorthStar Generator Head - 6500 Surge Watts, 6000 Rated Watts, 13 HP Required, J609B Engine Adaption Brushless design with high quality copper windings 50 Amps @ 120V; 25 Amps @ 240V SAE J609B engine adaption 6 1/2in. bolt hole circle with 2 upper mounting holes 30deg off vertical; 45deg off vertical for 2 lower mounting holes 5 3/4in. center pilot