Friction noise

Hello,

After riding 30min and the engine is hot i can hear a friction from the engine.
Hard to tell where is from but i think perhaps a piston,  a valve, valve guide...
if someone have an idea it will help me to seach the problem when i will look inside tonight.

You can hear the friction on the video... below the engine noise



Best
F

 

Dry valve bucket? Spat a shim?
Does sound a rotational tapping noise to me. 

sorry i post a wrong video.... try to upload the best one ...

here we are



youtube.com/shorts/VrDK7wc79Cc

Carbs need a sync
Controll valve lash
Controll and adjust cam chain tension
Controll cam chain guide and top idler, the old rubber damper parts can disintegrate and fatal failure!

 
 
 

Ok i will check that .