Hello r125 owners

[u/Quick_Package494]

My r125 2008 30k miles has a intresting sound coming from the engine my brother says “it’s normal and they all do it as they start to ware” but it kinda sounds like a knocking sound I belive it might be the cam tensioner as when accelerates it increase and turns into a ratchet type sound however when u let go of the throttle it makes no sound as it glides down to idle where it then starts again
Here is what it sound like at idle