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10-4 on all that Oscar said. I would do a compression check even if I had to pay them to do it before I bought the tractor unless it's so cheap already you could allow for a set of pistons. Perkins ideal dry compression test is 350psi with all injectors out and with a good hot battery to spin the engine. I would be leary of compression below 175psi. You can't really tell about the pistons when you look at them with the head off unless you pull out the pistons. The pistons don't crack on top where you'll see it, they break the ridge out of the piston wall between top and 2nd compression rings. The folks where the tractor is probably do know not to use ether, but they can't sell them to you til they crank it. Then after you bought the tractor it's your problem so it does'nt effect them on the repairs. Like Jack C said the Dexta have live hydraulics and live pto and are extremely more powerful. They are only rated about 10-12 hp more than and 8N, but they have about 2 to 2.5 times as much torque, the torque is what powers, not HP. Depending on what part of the country you're located, but around here (Houston, Texas) there are plenty of parts for the Dexta-Super Dexta and they are more reasonably priced than for 8N or comparable Massey tractors. As far as for work purposes go I would'nt trade a wore out Dexta for a new N series. Some books rate the Dexta from 30.5 to 38 HP. I set my injector pump timing ahead to 30 degrees then gave the pump 20% more fuel pressure and this one holds a steady 44 hp on the dyno at 1600 rpm's.
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