How do you adjust the bobbin tension in the Huskystar C20 sewing machine, the manuel does not state this?

If your Huskystar 207 sewing machine is stuck on zigzag stitch even when you have selected a straight stitch pattern, there are a few things you can try to troubleshoot the issue:

1. Check the needle position: Make sure that the needle is in the center position. If it is not, you may need to adjust it using the machine's settings.
2. Check the stitch length and width: Make sure that the stitch length and width are set to the appropriate settings for a straight stitch. Refer to your manual for the correct settings.
3. Check the tension: If the tension is too loose or too tight, it can cause the machine to sew a zigzag stitch instead of a straight stitch. Make sure the tension is set correctly for the fabric you are working with.
4. Clean the machine: Sometimes, a buildup of dust and lint can cause the machine to malfunction. Try cleaning the machine, particularly the bobbin case and feed dogs, to see if this resolves the issue.

If none of these steps resolve the issue, you may need to take your machine to a professional for repair.

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Viking Huskystar C20 Manuals

thread tension is by a knob on the face of the machine
if you find by adjusting that , nothing is happening , check the way the thread has been put in as it can get behind the pressure plates and jam on the bolt or not be between the pressure plates and just running free
bobbin tension is by the small screw that holds the flat spring under which you pull the thread after fitting in the bobbin back in the carrier
( seldom need to adjust bobbin thread tension)

According to the manual, you should not need to adjust the bobbin tension (and I located other sites which stated the bobbin tension cannot be adjusted on this machine). Apparently, all the tension adjustment is accomplished through the upper thread::
"EN Thread Tension Upper thread tension Basic thread tension setting: "4". (1) To increase the tension, turn the dial to the next number up. To reduce the tension, turn the dial to the next number down. A. Normal thread tension for straight stitch sewing. B. Thread tension too loose for straight stitch sewing. Turn dial to higher number. C. Thread tension too tight for straight stitch sewing. Turn dial to lower number. D. Normal thread tension for zig zag and decorative sewing. Correct thread tension is when a small amount of the upper thread appears on the bottom side of fabric. Lower thread tension The bobbin tension has been set correctly at the factory, so you do not need to adjust it. Please note: - Proper tension setting is important for strong seams. - There is no single tension setting appropriate for all stitch functions, thread or fabric. - A balanced tension (identical stitches both top and bottom) is usually only desirable for straight stitch construction sewing. - 90% of all sewing will be between "3" and "5". - For zig zag and decorative sewing stitch functions, thread tension should generally be less than for straight stitch sewing. - For all decorative sewing you will always obtain a nicer stitch and less fabric puckering when the upper thread appears on the bottom side of your fabric. 1 A B C 22 D"

Doing further research, I found this statement on a machine review site:
"After reading reviews online from where I've bought my drop-in bobbin machines, I think many of the negative reviews are due to the bobbin thread coming up without laying across the bobbin. It can cause the stitches to look very sloppy and no amount of tension adjusting can fix the stitches."

There are several machine review sites wherein 4423 owners stated their disappointment in the 4423's performance. Some said the machine failed almost immediately and others said the machines developed problems when sewing heavy fabric.

try lubricating the drive- you may already have a drive problem-cheer Denny

Have you tried to re-thread the machine? Check to see if the thread is in the take-up lever. There also might be a piece of thread or lint caught between the top tension disks.

Sounds like the hook/needle timing. To check do the following:

With the power off!!
remove bobbin and bobbin case.
push needle all the way to the left.
Turn handwheel toward you watching the needle and bobbin housing hook. The point of the hook should line up right above the eye of the needle.

If not timing, clean bobbin area removing lint and thread.
Check bobbin tension, should get slight resistance when pulling thread.
Make sure using only Husqvarna Viking bobbins -- most are green but they have new colors now. All will have the Husqvarna logo on them (an H). Make sure the bobbin is unwinding in the right direction.

Remove fabric. Pull extra long bobbin thread (about 3 inches). Hold upper thread tail in left hand, turn handwheel toward you for 1 revolution. Is the bobbin thread caught by the top thread and pulled through the opening of the needle plate?

If you are still unable to get a good stitch, take to an authorized Husqvarna Viking dealer for service or have them send to Husqvarna Viking (SVP) Technical Service Dept for repair. A list of dealers close to you can be found at the Husqvarna Viking website - http://www.husqvarnaviking.com/us

Good luck.

no u gotta go to shop onlt

I had this problem when I first bought my machine. I took it in and they told me it was a recall problem. All the machines were having the same problem. They fixed it and I have not had the problem since. I bought mine at a Joanne fabrics. Hope this helps.