Does anyone remember this thread?
 

It's been awhile, but someone posted a thread about their machine sewing tiny stitches instead of regular length stitches. My Juki is doing the same thing and I have tried everything to get it to sew regular stitches. The stitches it sews now are tiny and I can barely get a seam ripper in them to un-stitch them. I have done all I can think to do and wonder what it could be. Anyone have any ideas?? Thanks in advance and hopefully someone will have a solution.

Sounds like the feed dogs aren't doing their job. Simple problem would be you are pulling on the fabric or it's getting hung up somewhere. Clean it well. Make sure you take the plate off and clean thoroughly around the feed dogs, and clean the feed dogs themselves. Make sure that the setting or lever used to set the stitch length didn't get bumped or set wrong. Also, check the presser foot pressure.
And finally, make sure the feed dogs aren't lowered from a FMQ session!

thanks for the suggestions. I will try it all tomorrow and let you know.

When my machine does that, I change the needle and do a cleaning with the mini vacuum tools.

Good luck on finding the cause of your trouble.

In addition to what everyone else has said, if you're quilting, make sure your quilt is supported. The weight of the quilt can be too much for the feed dogs or walking foot to move if it's just hanging.

Are you using an attached walking foot when this happens?

I had that happen with my old brother when I was using my walking foot. Turned out I had too much "pull" from overhang of quilt that was affecting my tension.

The reason I asked about the walking foot was that my walking foot started hanging up rather than advancing as it was supposed to. The result was tiny stitches, almost sewing in one place. Cleaning it and lubricating it did not solve the problem. A tiny rubber washer placed over the arm and around the needle screw, to insure that the walking foot continued to go up and down, stopped that nonsense.