What model and year Fordson is this Derick? I have the instruction book for the N Series which has detailed information on how to time the magneto. Sounds like the mag has not been installed correctly. On mine there is no kick-back as long as the advance / retard lever is in the correct retarded position for starting. If you need any additional info, please PM or email me and I can send a copy of the magneto section to you.
Regards,
John
Regards,
John