I am very sorry I miseed your reply!
This is very useful information,(RE. timing at 26 dgrees and trying it )
I got busy with spring work and have not had a go at the old Fordson for some time.
Playing with the adjustment on the coupler helped, but it still runs rougher than the other old FSM I have, so I will try your reccomendations.
I Will report back when I have done so, but am awfully tied up with farm stuff at present.
Thank you again Mike!!!