[Joesmallwood]

Originally Posted by proporsche

it is not the valve adjustment, it is not the chain tensioner,
You should drain the oil and see if there is any debris on the drain plug .
Also more info would help...the rpm is too low-why ....and also sounds like a rod noise..
Do you hear it when cold only or hot as well?
Ivan

^^This. Way too solid/beefy/low pitch for a valve issue. It's a solid sound that would lead me to rod, loose flywheel, or something much larger/solid.