Here's a late model euro style B jug for sachs. it's a "BX" and is common on the euro 2 speed manuals.
square jug, but "B" restricted.
note the weird segmented removeable transfer walls. odd. Also, tiny restricted exhaust, flat port exhaust mount and flat-to-angled intake port & adapter.
also they came w single ring piston & 44mm (long D-length) crank but are restricted heavily for 30kph.
here's a euro late-model D, besnik was just talking about this coming on a Portuguese SIS w/ sachs motor
It's a "DS" or "DK" designation (the K was for kickstart sachs - same topend)
notice the single ring piston, flat intake and exhaust ports, groove in the fins around where the head would separate
nice trannies, BIG exhaust
enjoy this worthless info.(edited)