We are not ignoring you honest! Unfortunately there are very few BKs about. I have one BUT it is currently living in someones shed, until I can find the time and money to do anything with it. Bought it back from Germany in a transit van some years back, and unfortunately it has beedn shed hopping since then.
There is a BK forum
, It's German but there will be some English speakers and Google translate helps!
if you Facebook ( some do some dont!) there is the MZ riders group UK which has members from all over the world and at least one owner of a BK350
ES250 Doppelport, ES250, ES250/1, ES250/2,ETS 250, ES150, ETS150, BK350, IWL Pitty, SR56 Wiesel, SR59 Berlin, Troll............ and thats just the German two strokes!
http://thecomeconcollection.blogspot.com/