Ok, sometimes, my machine will stop moving in the bobbin but the needdle will still go up and down. This sounds like your problem. Lift the head and under the right side of the machine, you will see where the internal belt goes around the bottom (cam?). To the right of that, you will see two little swing bars on the end. Get one of the two bars to connect with one of the slots, press the button on the right (there are two buttons on the base of the unit to the right of the needle), and turn the wheel in the wrong direction. This will lock the cam and you can sew as usual.
If the feed dog stays in one position and just moves up and down, and doesn't pull the fabric through, press on the button in the bed closest to the needle bar. Hold it down and rotate the wheel. This adjusts stitch length/feed dog travel. There should be numbers on the wheel or under a flat metal panel next to the wheel. The numbers are for stitches per inch.
The problem you describe isn't timing, it's most likely stitch/feed dog adjustment.
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