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This might sound like a daft question but, as it's a two stroke won't it run in either direction?
But not the same engine that Wolfgang has, his is bigger.
There is a bit about them in this old (and now politically incorrect) book towards the endhttps://docplayer.org/56564840-Jahres-inhaltsverzeiehnis-band-8-lieft-seite.htmlThose castings don't look too difficult to carve from solid, the most work would be in the cylinder casting but it may be possible to do that in steel and silver solder on some of the bosses which would make it quite easy. Also quite easy to make patterns if anyone wanted to cast them.