thanks..everyone opinions may vary on this, The book says 12 hours, I'll tell you, your motor has already been run at wide open throttle, KTM motor dyno's every engine to insure it's up to snuff, then they install it into the quad and chassis dyno the quad, if I remember right 15 minute engine dyno and 20 chassis dyno, I broke mine in on the dyno at WOT, mine has 49 hours now and still is making the same power as it did new...
The key to successful break-in is to ride the quad easy but not so mellow that the rings cant seat within the cylinder. The best way to do this is to combine a high load with low rpm. In other words lug the engine a bit by riding smoothly in a higher gear then necessary as opposed to popping it into one gear and revving it out.
And did you have any probs with the engine after that? (i know it doesn't prove anything, it's just 1 atv)it was tough to stay in with in manfactures specs for break in but i did it with my predator 1 hour oil change then 10 hours of easy riding. Longest ten hours of my life LOL