Hello All: Have a nagging problem with a carb leak on a '72 R75/5 that I'm rehabbing. Despite having replaced float, float pin, needle valve; resetting of float numerous times, still getting overflow when engine runs. Actually, the flow seems to come not over the float chamber but from the "overflow" valve in the center of the chamber. Seems that the needle valve is still not shutting down fuel delivery, and it is overflowing. Any ideas? Many thanks.