I have a Sears Craftsman Lawn Tractor model # 25621, serial number 733250307 2n00025,
Megdate 97034. I search for one owner's manual at http://www.managemylife.com/mmh/owner_manuals/ but found no owner's manual.

Do you have any suggestions on finding this owner's manual?

Thanks

Your best bet is the place you bought it http://www.searspartsdirect.com/partsdirect/index.action Check under the seat for the model number, this site does not like what you have given us. Copy it exactly including and decimal points or periods. Sears tractor model numbers are frequentlu 9 digits long with a decimal between the 3rd and 4th digit