Make sure the carb did not loosen. Also, you said you checked the clunk and it looks ok. Was the clunk line one of the ones you replaced? Perhaps the impact put a pin hole in it. Watch for air bubbles in the line when it's running. You also could have gotten something in the needle assembly. Try removing the needle and the fuel line and attach a fuel line to the needle side so you can use air or fuel to flush it out.