if you don't already know this, you should try a pair of bicycle or MC specific shorts (underwear). I have a Boejangles and have done 4 hours straight in the saddle. While I was fatigued, the only thing that really bothered me was the burning feeling of where the seams of my underwear were - it sucks!
I bought a pair of EVS Sports Bruiser Shorts (PP05) for $50+. They have the chamois where you sit (
) and pads for when you fall. I will be trying them out after work thru the weekend - long trip!
report in the equipment forum entitled "bruiser shorts"
Might be a cheaper way to last on the stock seat, or with the KTM comfort seat. I am thinking even with the Boejangles saddle.