Have you checked the throttle housing? If the tube is too far in the grip will drag, I've had cracked throttle tubes, the little cable wheel on the Housing, needs to be clean and free. I don't lube throttle cables, myself. It will run into the top of carb. It should be snapping closed "Whack" Should have some slack, too. Is graphite white? Sounds like grease, or water and oil product.