Adjusting tension Top tension is too loss

Question edited for clarity.
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Sewing machine tension is a delicate tug of war between the bottom Bobbin tension and the Upper tension to put the loop between the 2 layers of fabric. You set the Bobbin tension first and the the top tension depends on the fabric and the thread used.

Your Bobbin tension is very very loose to be not tensioning at all or the top tension is too loose.

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Janome Memory Craft 6500 Professional Manual Online: balancing thread tension, Adjusting The Tension. Correct Tension: The Ideal Straight Stitch Has Threads ...

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Not sure what you are asking. The standard factory setting for top tension is the midway point on the dial. On a lot of machines, it is marked in red. The bobbin tension is set by a technician. If it has been adjusted, it will affect both bobbin tension and top tension. That is why it is very important to make attempts to resolve a tension issue by adjusting the top tension BEFORE adjusting the bobbin tension as a last resort.

Tension is most often adjusted at the top tension dial. Only in extreme cases where the top tension does not make the needed adjustments would you need to adjust the bobbin tension. Also, bobbin tension is very sensitive and can easily throw your machine into a tizzy.

Basically, sewing machine tension is simply a tug-of-war between the top and bobbin thread. When they are equally matched, the threads will meet in the middle of the fabric. This is the optimum tension for most sewing. If the bobbin thread is coming up to the top of the fabric, the top tension is too tight--loosen it. If the top thread is going to the underside of the fabric, the top tension needs to be tightened. The higher the number on the dial, the tighter the tension.

FWIW, tension is static. It is not one of those, set it and leave it forever deals. Whenever the fabric, needle, thread are changed, there's a good chance the tension will need to be tweaked.

Understanding Thread Tension Threads

Install a brand new needle.
Remove the top thread from the machine.
ALWAYS RAISE the presser foot and rethread the top from the beginning.
Set the top tension to the midway point and try your machine again.

If there are still issues with the top tension and adjusting the tensioner isn't working, there may be gunk, lint or thread stuck in the tension disk. Remove the top thread. Set the top tension all the way to Loose. RAISE the presser foot. Dip a length of perl cotton in rubbing alcohol, squeeze out the excess, and then "gently" pull the perl cotton "DOWN" through the tension disk a couple of times. See if that helps.

I'm sorry, but you will have to be more specific. There is a top and bottom tension. The top tension is adjusted using a dial of some kind, visible on your machine. It has numbers on it; generally the lower the number, the tighter the tension. The bobbin tension generally does not need adjusting, although it can be adjusted. Please write again to let me know what it is doing that leads you to believe the tension needs adjusting.

Keep adjusting the tensions top and bottom until you get it right

I assume you have tried adjusting the top thread tension and are referring to bobbin tension adjustment. Before you do anything, with the bobbin properly threaded, manually pull out some bobbin thread. There should be resistance, just like the resistance you feel when you pull on the top thread with the foot down. Bobbin tension adjustment is by means of a small screw in the bobbin assembly. Mark the screw head position before you start adjusting it (so you can return to that position should you need to). Make small adjustments (1/8 turn of the screw) in each direction and see if it helps the problem. Be aware that thread tension is only one of many problems that can result in faulty stitches.

1Sew a test seam. Ads by Google
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3Find the position of the knots.

4Tighten the tension and "pull the knots up" if the knots appear on the bottom side of the sewn seam.

5Loosen the tension and "drop the knots down" if the knots are on the top surface.

6Sew a test on the fabric you will be using. Tensions often have to be adjusted when changing fabric types and weights.

7Continue adjusting the tension and inspecting the seam until your seam is balanced.

Your tension is way too loose on top or too tight on the bobbin. Try adjusting the top tension one number at a time until you get it right. (Only adjust the bobbin tension as a last resort). Also you could have different thickness of thread in the bobbin than on the top or are sewing a very heavy fabric. Try adjusting the tension with same thread in both bobbin and top and use a normal weight fabric until you find the right tension to get you back to a normal stitch before going to a heavier fabric or thread.

I have an Elna 2005 machine and had a similar but opposite problem whereby the tension up top was too tight - thread wouldn't pull smoothly. I found adjusting the feed dog lever slightly helped the stitches a lot, even though the needle tension up top is no better. Hope that helps! :-s