I thried to search the Fourum and found nothing on this subject, But does anyone have a PDF of a Mercury MK 20 Oweners manual? there is a coppy of the service manual in the Glassica library but no Owners Manuals, My father got this engine from a friend and is having trouble getting it going and wants an owners manual.. None on the E-bay..
You probably need the Service Manual more than an Owner's Manual. (JMHO) Mercury Outboards 1965 and prior manual # C-90-25500
Check to see if the beast has spark before you spend any money.