Welcome to MLF Kevin. I'm not familiar with Yazoos but the deck clogging issues that I experience is usually from mowing wet or damp grass. There are some weedy grasses that retain a lot of moisture and tend to clog up the deck as well. I would try cleaning the deck thoroughly and possibly coating it with PAM or some other deck product and try mowing when the grass is dry. Another possibility is the blades are worn down and not producing enough vacuum to discharge the grass.