For sale this rare model engine, which I was not able to identify. I tend to think that it is a HB but I am not sure. Anyway it's construction is very nice.
It has 15mm bore, 13.5mm stroke. This result a 2.38cc engine.
Despite the fact that cylinder and piston looks very good, it has no good compression at all. One thread for cylinderhead is worn and it need to be repaired (it can be repaired!) and this can be the reason of poor compression due to the head is not firmly fixed. It is also missing the rear gasked so the backplate is not completely tight to avoid rubbing the crankshaft.
This engine is for sale as you can see in photos, including 3D printed support for display.
Worldwide shipping available. For any other details do not hesitate to ask.