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Hard one to figure, when you are turning it, is the compression release lever on off ? I can turn the motor over on my D7 from the fan, but if I forget to move the compression lever from run to off, it builds up compression and gets harder to spin, never tried to see if I could continue and get over the hump without moving that lever and with good reason, even though the fuel is off, it could fire up ! When hand cranking the pony, it does the same thing, you can feel when it starts to build compression, it resists, then releases when you continue, then easy and repeats. When trying to start mine by hand, I bring it to that point of compression, then pull er over, seems to give better leverage to start by hand Being that is a smaller motor, you would think it would spin with ease when the compression is released. Possibly check the linkage of that to make sure it is opening the valves. Was the exhaust covered ? Any possibility of water getting into the cylinders ? Not sure if it could have been partially stuck, but was freed up before it seized, resistance your getting is from rust on the cylinder bore ? That is always my biggest concern when an engine seizes, what do the cylinder bores look like and what damage will be done to them if one runs it without taking the heads off, and cleaning the cylinders up correctly. Only other things I can think of is vapor lock, or something mechanically wrong with the motor, crankshaft, rods, pistons, stuck valve etc. If there was a stuck valve, that would seemingly not allow the compression lever to operate, if it was one of the valves connected to the linkage. Oh, well, not that familiar with the older D4's, just airing some thoughts out, see if you can get some more detail on what's happening, others may have some thoughts here on this, hopefully it's something simple.
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