GV650 Noise from engine when idling

Hi,

Any one ever experienced a ratling noise from the engine when idling or driving at very low speed?

The noise disappears as soon as the clutch handle is activated or running the engine at slightly higher speed.

It seems not to impact on performance so far but am a bit affraid it might damage something inside the engine.

Before I take the engine apart I thought to ask if someone has experienced this and found a possible cause.