They have an impulse magneto. When you turn the engine over real slow (by hand), you should hear the magneto snap. When it snaps, you should get a healthy bright blue spark from the plug wire to ground. If that mag is working right, and you have fuel, it should start. They are neat machines.
Another poster mentioned a stuck valve. They were common on the old Gravelys, so common that the valve head has a screwdriver slot cut in the top, but if you are feeling hard compression as you crank it, it's probably not stuck. It takes a lot of oomph to spin one over.
If you have access to an old tractor with a belt pulley, you can belt up to it and let the tractor spin it over. I remember the Gravely shop in Harrisburg, Illinois having a big electric motor to spin them. And I knew a fellow who used a big right angle grinder to start a Wisconsin engine on a self propelled concrete saw.
Once you get it started and the bugs worked out, it will usually start the first pull.
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