Hello, since tomorrow with my thickness in the engine room (from now on to the same). It comes from the left side (if you are standing in front) or from the front left. The sound can only be heard in idle mode, as soon as you give gas it is gone. I once touched the control chain (through the oil fill hole), but it can not move a millimeter in any direction and is bomb-proof. Power is available, oil is also Ok, no special exhaust clouds, consumption is also Ok. I hope ma l not that it is the control chain I have a picture (where it claps about) and attached an audio file. MfG Sven