See if this works with your machine
Janome White Bobbin Thread. 100% Spun Polyester, #90 weight, 1750 yards (1600 meters).
While these pre-wound bobbins are meant for Embroidery, they can be used with sewing only machines. Sewists have used both the 90w and 60w for Decorative stitching and Quilters have indicated that stitches made with 60w bobbin thread sink better into the fabric and lay better in their quilts.
This is thinner then regular thread, which is 50/2.
Part Number: J208-16C
Guaranteed to fit because it is a part.