We need a better description than "screw on bottom of housing". A pic or reference to a drawing in the parts fiche would help. Some screws have sealing washers.
As I recall, the transmission countershaft on my K6 1000 has a seal that is known to leak and replacement requires splitting the crankcase. It's close to the sprocket. But I think that they've redesigned that area on newer models to make replacement easier.
Last edited by billv; 09-09-2019 at 12:50 PM.