That would depend on what brand of motor you have. There are several sites that would help identify a motor by either the serial nimber or model number. Here are a few:<br /><br /> http://www.marinshopen.se/guide/guide.htm <br /><br /> http://www.kencook.com/kccwww/marinepubs/oml12.html <br /><br /> http://www.brokeboats.com/omcid.html <br /><br />You could also do a search on this forum, using the search function at the top of the page, for "year of motor" and find a days worth of reading on the subject.<br /><br />TRP251
