T@BD- I'm not going to argue in a members thread but having worked on quite literally several hundred GY6 engines, ranging from the 139QMB 50cc to the 161QMK 200cc, the valve lash IS a critical issue with these motors. If the valve lash is set too tight it won't allow the valves to close fully which leads to power loss, hard starting, poor idling, and eventually burnt valves.
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