Thank you very much,
certainly, the engine valves need adjusting, It is planned for tomorrow,

the noise that worries me is the noise that comes from the bottom (at 1:24 for example, or from 1:37 in the recording), I know it's hard to understand the recording and I really appreciate any help in diagnosing the noise before I start to dismantle.
after the valve adjusting ill do another recording, (if hopefully the top end noise will disappear).

thanx again for your help

For everybody's information, this issue was resolved and covered in this thread.