Just a thought
This is just a thought I have, but you don't by chance have a bad intake gasket or loose intake manifold. The reason I am thinking this is:
When cranking slow it may allow enough reduction in vacuum to not pull or vaporize the fuel well. With ether it is vaporized from the can. As for using the gasoline if it doesn't vaporize it will not start. Have you tried to crank it using your hand over the carburator? This one is an interesting problem. I kope you figure it out and I am following this one.
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Gary
1974 1650 50A "budscub" Was my fathers
1969 125 42"
1978 1450 44A dual hydraulics
1984 782 50C dual hydraulics, waiting for vanguard
Z-force Cub cadet Zero turn
Sears '66 Suburban 10 Sears '66 Suburban 12
2 Breaking plows, 2 disc's, front blade, rear blade, Sickle bar mower, 2 decks 3pt harrow
74 "Green 100 "John" 
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