Re: Mercury Mark 25 Prop Adaptor Home › Forum › Ask A Member › Mercury Mark 25 Prop Adaptor › Re: Mercury Mark 25 Prop Adaptor jeff-registerUS Member - 2 YearsReplies: 1564Topics: 54 February 1, 2018 at 12:01 am #70478 Again, Better to run Elmer’s design. Yes my KG4 & 7 are not for sale cept 2 Dave. My 63 200 runs better bonded & auto trans powerhead, Just Me