60 Views but no response,
any way, If someone is having the same problem,
I fixed it by setting the valves to smaller clearance, I adjusted the intake to 0.10, and the exhaust to 0.18,
the noise (rattle) now disappear on cold or warm engine.

At first I thought that because of the hot weather here then you should adjust the valves most open, apparently I was wrong.
However, now everything is fine.

thank you.