Quick valve cover take off showed nothing broken, and the 4 bolts holding valve were tight
Here's a 5 sec clip of just turn over to watch
https://youtu.be/S800-onfLFU
Now I need to get engine at TDC and go thru the valve adjustment procedure, per the GY6 manual I downloaded from here.
Q: How to manually turn the engine, to get it to TDC properly?