How to fix bobbin timing?
Check to see the bobbin case is in fully, and the shuttle race cover is secure. Also make sure the needle is not larger than specified for the machine (many machines can't cope with size 18 or 19 needles!) Also check to see if the needle is of the right needle system (not a serger needle!), and fully up in the needle clamp. The needle package should show one of these needle systems: HAx1, 130R, 130/705H, 15x1, SY 2020.
See: http://sewusa.com/Sewing_Machine_Repair/Sewing%20Machine%20Hook%20Timing.htm
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