Back in the day, when I sold K75's new, I knew this: the worst thing you could do was show customers how easy they were to start. Do it once or twice, you can foul the plugs pronto.
Dry everything out, try again, vroom. Not much will kill a K75... much like an airhead, but simpler in a lot of ways (I look forward to the drubbing for this...)
'66 BMW R60/2, '83 BMW R100RS,'81 BMW R100RS "Das Beast", '87 BMW R850R '77 Honda XL125