A king sized quilt will go through a Janome 6500. I have now done three King sized quilts on my Janome 6500. After my quilt is basted-pinned securely, I stitch down the lengthwise centre (this is the hardest of all) and then stitch through the centre width-wise. My quilt is then divided in four and I quilt one quadrant at a time. I am not an expert machine quilter by any means but was able to machine quilt these big quilts quite satisfactorily. It helps to have extra table space around your machine to hold the weight of your quilt. My machine is in a cabinet, so I pull it out from the wall and put a fold up table from Costco behind it for extra support. I don't really roll my quilt but "puddle" or bunch it up a little to get where I want to quilt. By twisting and turning, eventually your quilt will get done.