If they were in Clayton Co. in 1880, then I think that the community of Motor you are referring to is in Clayton Co. In the 1875 Illustrated Atlas of Iowa I don't find any Motor in Warren Co, but there is on in Clayton Co. I have pictures of my ancestors taken at Motor mill in the early 1900s and I have there. It is a wonderful historic site now. If I can be of further help, let me know. Grace, born in Iowa