Hello, maybe there’s one more idea. I bought a used Spider Bj. 2000 with engine damage. The engine jumped normally and ran a little unround in idle. With increased idle and more there are quite loud noises to hear. This one has felt in the cylinder head. It’s not the typical nailing of the phase adjuster. So, after careful checking I noticed that the cable was eaten off from the camshaft sensor. This I soldered again and started the engine again. Now it was that the noises were heard already in idle, besides, you got the impression that the engine somehow jammed easily. It runs so slightly jerky. After that I controlled the stuer times, these were ok. After that I did not dismantle the cylinder head. Head gasket is ok, nowhere burned. I still expanded all 16 valves, no spring broken, no valve crooked, no seat deformed. Everything was fine. The engine block looks very good in the combustion room. The piston can also be overly fixed. The piston shaft has a problem.