Sounds like a timing issue to me too. Check a dealer for the proper timing or better yet get it serviced. Sewing machines can be very complex and are beyond the mechanical ability of most people.
SOURCE: replace a motor belt for sewing machine
The top tension is dependent not just on the tension dial, but also on the little disks that you go through to thread the machine. If it is not threaded correctly, you will get bunching underneath. Sometimes I just have to rethread the machine-- when you get to the disks- hold the thread taut and push it through the disks before going up to the arm part. Here is a threading picture I found- but it doesn't point out the disks too much. Once the machine is stitching nicely, then the tension dial can be used to flatten out the stitches.
http://www.sewusa.com/Threading_Diagrams/Threading_Pages/Singer_Sewing_Machine_Threading/singer_900_futura_threading.htm
SOURCE: sewing machine stopped making the stich
Unthread the needles, rethread the loopers properly, then rethread the needles. Make sure that all four threads are pulled securely into the tensions and retry.
The loopers must always be threaded before the needles or it will not chain.
SOURCE: How do I set timing on an Elna Carina 1980 model?
there is a service manual to download at this website http://www.arizonaexpressionz.com/elna_service/carina_500_service_manual.pdf
but it is written for a trained technician and may assume a certain level of expertise of the reader.
Hope this is of assistance to you.
If you are in the USA you could also contact White Sewing Center, www.whitesewingcenter.com - this gentleman actually trains how to repair sewing machines, and sells many Elna parts, machines and services them too.
Search for:
Make Model error 211
or check the Troubleshooting section of your owner's manual
SOURCE: How do you correct/fix a 316 error/main shaft motor error on a Tajima 2 head embroidery machine
I hope this link will help.
http://www.digitsmith.com/tajima-tmfd-g1220-type-2-error-316-a-31639.html
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