[Royce P]

Many of the "New Commutators" sold by the vendors are poorly made. Do you still have the original one? You need to have 2+ gallons of fuel in the car. Set the carburetor one turn from closed on the mixture knob. Make sure the timing is set properly so that spark for the #1 piston occurs just past TDC with the lever all the way up. You may have to bend the timer rod to get this right.