so, just checked the engine and it is a newer model Moped engine with 11,5mm inlet.
The minus clamp is screwed with one of the blok screws and the Aluminium casting has a rough structure.
But I found a right version one in my fundus:D
This engine is also a Moped engine and has the minus clip riveted to the blok. Also the Aluminium structure is not rough like on the new model one.
and will check the fuel tab now also:'(