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Change needles if they have done a few hours. Ales use ballpoint if seaming stretch fabrics.
Also you can get EL 705 needles, which have a longer scarf (groove at back) which helps with the loopers catching the needle thread. Or SUK is the stretch type with this longer scarf
Also if you are using cheaper thread cones, try a better quality with smoother finish and consistent weight, this will help too.
However if this doesn't resolve issue, your looper timing might need adjustment.
I "THINK" I have my machine threaded properly but it will not make a chain stitch. I followed the thread guide for the narrow three spool set up with the right needle setting. why would the machine not catch the chain ????
here's a tip I learned for sewing machine or serger
do one thread cone at a time-the cone or spool that's on the serger--cut the thread close to the cone-then remove the cone from the serger ,,don't remove the thread that you just cut from the serger,,now put your thread on the spindle & tie your thread to the thread that you just cut (make sure it's a small knot) now the thread that's in the needle pull until the thread that in the needle is your & then cut off the other thread & make sure to cut of the knot part & leave a thread tail of 4 to 6 inches
are you doing embroidery? if so turn off jump stitch cutting if possible. is the machine threaded correctly (pull needle thread out of machine and thread again with presser foot raised.
check for foreign matter in needle tension assembly. ensure there is sufficient needle thread tension.
the thread you see caught up underneath the fabric will be needle thread and indicates insufficient needle thread tension or something preventing the needle thread from being pulled up into the fabric (maybe a damaged bobbin case, or bobbin case position finger, or damaged needle plate hole).
You have to get the replacement wires from a Babylock dealer, I did too then after sticker shock at the price of that wire I learned to make a thread cradle and use that to thread difficult threads no. Take about 24 inches of regular sewing thread and fold it in half, put the open ends (together, same legnth) into the jet air port and hold onto the loop end, press the jet air threader and it will thread the machine, insert the thread you want to use into the loop you have in your hand and pull it thru the machine using the ends of the thread you put thru the machine, sounds harder than it is and works all the time. No more spending $8 on replacement wires. You can use this method for all the jet air sergers.
Make sure when you thread the machine you have the thread seated into the tension assembly on top, then make sure you have the threading ports locked and the switch in the proper place for each looper threading, the machine will only partially thread if you do not have the port locked and it will even still sew although not properly.