I have read a few old threads of people with the same on here. Idles great, can ride slow no grinding. When I’m going maybe 10 km it sounds like rocks grinding, real bad. When I’m up to speed it goes away. It’s a baha with a power fist 6.5. Just wondering if any of these guys got it figured out. New chain, clutch looks good. No idea. Loosing my mind. Help!!!!