The first machine that I quilted a king size on was my brother was a 7 or 9 in. throat. Then I got a Janome 8200 with a 11". Have done many king quilts on it. With all of the quilts, I mark into 4 sections. Mark the center of the quilt, using larger safety pins, the center of each side, also with pins. Start quilting in the middle and quilting the bottom right section then turn the quilt a quarter turn and starting in the middle again quilting the bottom right section. Before you know it you have the quilt finished.