On this site
Check the More Fun tab on the home page, go to documents and manuals, and see what's there. I know the manual for the Oday 23 is there. The 25 and the 23 are very similar boats, and I expect that the manual is also similar. BTW, the manual is nothing more than an oversize double sheet of paper. Unless you are looking for the most basic info on how to attach the rudder or screw on the turnbuckles, you will be disappointed.