Machine will not look stitchesw also bundles up bottom thread

Bird nest. Remove the top thread from the machine. ALWAYS RAISE the presser foot and rethread.

Sounds like it is still not feeding smoothly, Try putting some clear tape on the bottom of the foot and tissue paper under the leather. Leather is tricky sometimes.

be sure to hold the top and bottom threads in back and away from machine as you start to sew. once you have sewn several stitches you can let go and continue sewing. sometimes this is all that is needed to avoid the "birds nest" on the bottom of the project.

Try these suggestions
1. Change needle
2. Rethread the machine--top --make sure to use every thread guide
3. Take the bobbin out --make sure it is inserted correctly into the bobbin
Case, & make sure the bobbin is turned the correct way
4. make sure the thread has not come off the thread take up lever
5. Clean under the needle plate & in the bobbin area for lint or threads

try a top thread tension of 4

change to a new needle

clean under the needle plate & in bobbin area for lint or loose threads

also rethread machine top thread & bobbin just incase thread is catching somewhere

make sure the thread doesn't come off the thread take up lever

check to see if there are any burrs on the needle plate or the bobbin

Let me give you general instructions on adjusting machine tension. Make sure you thread the top with a different color thread than your bobbin so it's easy to see what's going on.

Thread your machine with the presser foot UP. The disks that control the tension (threadgoes through them) are tightened up if the foot is down. Change the machine tension with the presser foot DOWN.Because the disks won't be engaged (see above) if the foot is up, the diskswon't move. Start at the middle setting, 3. Go up to tighten, decrease toloosen. Each machine is different, even 2 different machines of the same model.The best thing to do is start at 3 and use a different color in the top andbobbin thread so you can easily see what changes to the tension do to yourstitches. Now use a straight stitch a sew 3 or so inches. Take a lookat the top and bottom of the fabric. You don't want to see any (or at least notmuch) of the other color showing from the other side. Loops on the bottom of the fabric means you need to tighten(increase) your top tension. If you're stitches on the bottom are causingpuckering, then you need to loosen you're top tension. For the most part, youreally don't want to touch your bobbin tension-leave that to a repairtechnician. The factory setting shouldn't be touched except by someone whoreally knows what they're doing. Keep sewing a few inches at a time until you have the resultsyou want. Now you're tension is where you need it!
Good luck!

Look on the FAQs section of the Singer website.
http://www.singerco.com/support/faqs.html
Just click on the questions for the answers to appear.
Hope this helps!

Hello,
Try these solutions.

* Re-thread your machine as it may be threaded incorrectly.

* Raise your feed dogs If your machine has this feature.

* When you start to sew a seam, hold the upper and bobbin thread tails back and out of the way as you sew your first couple of stitches. This will keep them from getting caught in your machine.

I hope this helps.

try to rethread the machine all the way back to the spool of thread and check the top and bottom tensions on scrap of same fabric

Check your tension disks, with your presser foot up, and the tension dial on zero. Sometimes a piece of cotton breaks off between the tension disks and then prevents the disks to work properly. Also make sure when you thread the machine, the thread does go through the disks and over the take up lever. After you threaded the machine, before putting the thread through the eye of the needle, lower the presser foot and while pulling on the thread with your left hand, increase the tension with your right hand. Do it slowly and you should feel in difference in tension. If this is the case, your machine should work fine. Good Luck!