No specific mention of outboards is made, only boats.<br /><br /> http://www.michigan.gov/sos/1,1607,7-127-1585_15242-34638--,00.html <br /><br />" Watercraft - Title Required<br /><br />All watercraft 20 feet and longer and all watercraft with a permanently affixed engine, regardless of length, must be titled. Watercraft not required to be titled may be titled as an option. "