My saw came with a thick kerf riving knife. I had the same question about it, and got about the same answers that have been posted here. What I did was make sure the riving knife was dead center, or as close as I could get it to the blade. I haven't had any problems with a thin kerf blade at all. Also the saw came with a thin kerf blade. Hope I got the thick and thin of this correct. Kind of confusing.