I finally received the gaskets and assembled the pieces yesterday.
I'm applying a thin layer of 350°c rated red silicone for a perfect sealing.
New head cylinder gaskets
Air filter, cutted to the right dimensions and soaked with 2stroke oil to glue particles.
Admission pipe set in place
Piston and cylinder
Gasket with thin layer of silicone
Very clean parts, assembled with a torque wrench
Mounted back on the moped
Exhaust gasket with silicone on the both sides
Perfect sealing. I do this cause I had leaks in the past.
The moped ! I oiled the chain, cleaned the rims/body and changed the gasoline filter, now I let the silicone dry overnight, I will try to use it tomorrow. The engine compression is really good.