The box you bought the lights in should tell you the wattage. Its my understanding the bulbs in the wally lights are too power hungry and you gotta swap em out for something smaller like 25 watts a piece.
Your stator only puts out so much. I think its 75w total if that.
I dont know why I said 75. The stocker is 55, the Ricky Stator is 75. Yeah, you need 20 watt bulbs. You can give em a bit more by getting an LED tail light, they are only about 1 watt.