I just got a os tz.12 motor and I am trying to find the factory needle settings. If anyone knows them it would be a great help to me. Thanks

Here is the 12TZ(P) manual:
http://manuals.hobbico.com/osm/12tz-p-t3-t5-manual.pdf

and 12TZ manual: http://manuals.hobbico.com/osm/12tz-manual.pdf

If you need further assistance, contact O.S. Engines technical support directly:
http://www.osengines.com/techsupport/index.html

Hope this helps.