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I have had this happen, check your tension on that thread and check the thread thickness. Tofix mine I recall changing both,and I think it was the thread thickness in relation to the tension
Make sure you are threading the machine correctly. Make sure you are using serger thread that isn't old. Make sure you are undoing all the threads when it breaks and thread it from the beginning.
Make sure you have the right needles in their respective places. My Juki MO has two different size needles.
How to Thread Juki MO-134 Serger from watching lady at Lyles.
Turn upper blade up. Push in first then turn up.It makes threading easier.
Blue Thread upper looper first.
Pull thread through tension knob. Don'tjust lay it there. (She thought that is what I must have done)
Orange Thread lower looper next.
Pull thread through tension knob as inthreading upper looper.
Adjust lower looper so it is right nextto upper looper so that their points are almost together and directly belowsewing needles. Lower looper will be in front of upper looper (I believe).
With tread from upper looper pulledback, slightly lift lower looper above upper looper and thread. I think this isright.
Pull thread back with other thread.
Tension is the key. Remember that.
Yellow: Thread left needle first.Remember tension. Pull thread through curled wire on left side of needle arm.
Green: Thread right needle. Rememberabout tension. Pull thread through curled wire on right side of needle arm.
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Note: Before sewing turn the wheel tomake sure the stitches are going together correctly.
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