Hello everyone

Greetings to all. I write this message since I have a slight fear. Since I put on the New Lightch Moto , my sling makes a very rare kind of cracking. He has always made that noise (since the escape put), but now that crack has been accentuated.
The sound comes from the engine, but I don't know how I can know what it is exactly. A relative put it at the escape, and he didn't tell me anything at all about the Rouion.
What would you do in my situation?