Ay dmb the switch on the needles worked and I'm glad cuz I dont like cns carbs my first engine had 1 and the gasket on the carb meltedand. so i couldnt ever get it to stay on tight enough I even bungied it around the engine to the frame with the help of some special stuff i got from the auto store cant remember wut they called it; but its got metal and a special card bourd for heat on the other side.