Hi folks,
I know this thread is a few months old, but I just now registered on this forum, and have just a small tidbit of info to add to the above solution, which is correct, by the way.
I bought a new Cub Cadet with a KT740 and WOT no load was only 3180rpm, and about 3,100 with the blades engaged, but before I could adjust the cable as described above, I had to remove a screw whose sole purpose is to prevent any engine speed adjustment above the 3180 rpm on my mower. I'm guessing that they were trying to limit engine speed to 3,200. Anyway, they had screwed a self threading screw through mounting bracket in such a way that it acted as a stop and would not allow the throttle to move beyond that point, at WOT. I'll take a picture of it tomorrow, just in case anyone else runs across this problem.
Anyway, I set the no load speed at 3,640 rpm, 3,500 with the blades engaged, and my goodness what a difference in the sound of the blades. I can hardly wait to see if it mows better than before.
Gil