Home › Forum › Ask A Member › 1972 Merc. 4HP MN. › Re: 1972 Merc. 4HP MN.
July 10, 2018 at 10:03 am
#79317
Spark on that engine should jump a 3/8" gap in open air.
IMHO, compression is a little on the low side. I’d have been happier with 120. Put a few drops of gear oil in the cylinder, crank it with the plug out just a bit, to disperse it, then put the plug in and try to start. If it fires now, uh-oh….
Long live American manufacturing!