Great pictures.
I've just rebuilt a Sanli lawn mower engine of the same size, and from the looks of it, the Chinese engine copied a lot of details from Honda.
Did you open the case on that engine?
I've worked out how the governor works, and how the decompressor works, but am wondering about lubrication. Seems to be splash only on the Sanli engine, judging from the internal contruction and the amount of aluminium shine in the old oil.