I reckon it's a 1979 <br />"Starting Serial No. F-10001 DT 5SN/DT 5LN"<br />After 1980 the S/N's were 0501-*******<br />for the 5 horse.<br />go to <br /> http://www.brownspoint.biz <br />and sign up. You will find some good .pdf parts lists with every part for your Suzi (I have a 1986 DT-6). You won't get an online manual, but you can buy one or do what Im did.. It involves a library and does not include remembering every page