We may have found other answers which could help you.
Click here for Singer Sewing MachineSinger 201 went bang , smelt and now won’t work?
Presser foot is loose?
the thread is bunching on underside of fabric it looks like birdnest?
how to get the tension right on my machine?
Engine revving up ?
My CG 500/550 Singer Sewing Machine's bobbin isn't working?