Here is a link to The Scott Guy's web site. He has parts, possibly manuals etc. Sorry I can't help on the year.<br /><br /> http://web.a-znet.com/~scottguy/
After reading the Scott Atwater site (link below) it looks like the 30 hp was only produced for one year (1956) as after that it went to 33hp. Check it out here:<br /> Scott Atwater Identification <br /><br />Cheers<br />Mike