Details & Changes.

Engine.

Until ch. number 20-069408 the engine had 25ps.
Dry aircleaner and a 130w generator.

From ch. number 20-069409 the engine had 30ps. Oil bath
aircleaner, a 160w generator and lots of other changes,
Actually it was a new engine, with many changes and
improvements.

An easy way to see if it is a 25ps or a 30ps engine, is to look
at the metal cover, besides the spark plug. If the cover
is flat it is a 25ps, if it has a pressing up, it is a 30ps.