Raphael, that is one very nice little engine and it was very nice of Jin to gift that to you!
Thank you for sharing that with us all!!
Is that actually an oiler on top of the port frame?
If that is an oiler, then perhaps you had the steam and exhaust lines reversed during your video, as I would suppose that the steam input would need to be on the side with the oiler if it is to provide any oil to the cylinder ..... yes/no/maybe?!?!