On June 19,2013 and July 17,2013, I had asked for help in obtaining a ring set for my 28N707 1131-E1 OHV. As Mr. Herrin brought out, since this motor had a AVS piston in it, the standard ring set would not work, nor did two other ring sets that Briggs suggested. You said try 698375. BINGO!
s.jenkins