I am pretty sure that our KBW 20 gearboxes do not have cones, but have clutch
packs although I have never been into one.
I tried to google
KBW 20 exploded diagram, got the space station, a carburetor, some kind of cylinder head
and a drill of some type, but no tranny.
It's my understanding that they have wet clutch packs similar to a motorcycle and that it is usually the thrust washers that wear first.
If it were me I'd certainly pull it myself, but send it off to be overhauled, often these things require tools and experience we don't have. I don't think them complex, but gear lash and somethings need to be shimmed correctly.
Now that my mind is working I think they may actually be a Hurth gearbox
Anyway I think they have a very good reputation, but are particular about having clean fluid, I just change mine each oil change
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