Hi, after I drove almost 80Tkm very satisfied with my 93 CB Sevenfifty through the country, now very suddenly when starting cold and then always when starting ugly, rattled noises from the engine. These noises become less with increasing warm-up, but do not disappear completely when starting up. Conjectures go towards the clutch (but this is already the 2nd and only about 30Tkm old) or also control chain. If someone has an idea what can be behind it te. If it is the tax chain; what would I have to pay for renewing it at a backyard workshop, so above thumbs? Thank you so much from Berlin Olaf