I had the same problem and I tried everything including removing the bobin case, cleaning out lint, changing the needle, adjusting the tension but it did not work. Then I finally tried reloading the bobin thread, making sure to load the bobin according the manual directions....and the problem was solved...no more tangles... just a nice even stitch...yeah!
I took the bobbin and casing out, then removed the hook race cover and hook. I cleaned it all and re-lubricated. When I put it all back together, it took care of the problem. I also adjusted the tension on the bobbin and removed the needle plate to clean underneath. I'm not sure what fixed it, but it works now.
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how do you adjust the bobbin tension?
Thread still bunching on clean new machine
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