25 horse Johnson’s built from 1980 to 1999 would have there model number start with 25. 2000 to 2005 would start with J. I am familier with the RD-10 through RD-17 25 horse model Which leaves the late ’60s and 1970s as likely years of manufacture. UNLESS it is a fuel injected model built by BRP. . . . 🙂
