Here is what I posted several years ago:
Kohler service bulletin #246 dated 4/98 describes procedure for pinning governor shaft for M18, M20, MV16-20, KT17, and KT19, requiring one 1/8 X 3/4 inch roll pin.
http://rich.homeunix.com/gravely/eng...lletin-246.pdf
or you can google it.