Hello there! I am trying to sell my beloved Guzzi in order to move overseas more easily. I have just had someone inspect it & was concerned about the noise it makes when in neutral with the clutch released. She tells me it's engine knock, as it sounds like chains, but the noise fades with acceleration & goes away either with the clutch in or in gear under load. It also appears to be coming from behind the engine, around the bell housing, as she said it was knocking when her ear was by that area. I'd upload a video but it won't let me. Thoughts? Is she lying?