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Riccar R651 Mechanical Sewing Machine - Page 4 Questions & Answers
Needle hits bobbin casing.
Don't know if you have a manual or not. You can read the manual from the link below. I would look for the bobbin area in the manual. There should be a section showing the bobbin area for cleaning and oiling. It may as simple as removing and reassembling the bobbin case.
It could be the timing and would require a service repair technician.
https://www.manualslib.com/manual/545699/Riccar-9600.html
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