yes, the engine shuts down with the key and by depressing the stop lever downwards.

cervan: govner spring...where is this spring located?

while my stop lever is not leaking like this one: http://www.peachparts.com/Wikka/OM601InjPumpOilLeak

i'm going to clean the stop lever because it does look a little oily and replace the rubber o-ring (if I do have one in my parts drawer)