Anssi Kantonen from Finland sent me this, there is also video of this engine running on Youtube
I used modified VW aircooled bus heads & cylinders + pistons. The
crankcase is old very early "Vickers" , british made. There are also VW
parts inside the timing side as cams. Bore is 88mm , stroke 85mm so its
near 70 cubic inches. BOSCH 50 degree magneto and Amal Concentric carb.
Heres couple of pictures of the complete bike. Almoust everything is own
design. The gearbox is 20`s German made "Hurth"
Hope You like it.
Anssi Kantonen Finland