For one point: To which motorbike does this engine belong?
Up to experts.
An Ariel?
Not a Square Four, not an Ariel.
American 'flathead'?
No.
UK engine?
No.
Integral oil cooler?
Well spotted :thumbsup:
If not a flat head, is it an 'L' head. I see the valve is 'upside down'
It is an 'sv'-engine.
Up
German?
No.
French?
No.
Ialian?
Yes.
Mondial?
No.
Aermacchi?
No.
Della Ferrera?
No.
Frera?
No.
Garelli?
No.
RAS?
No.
Fusi?
No.
Mid to end of the 30's?
Yes.
Sertum 500VL bicilindrico 1939?
Yes!! This point is for you.