Deere 720 downhill

Hi, My luck is running short recently. I have a JD 720 gas RC that usually starts on the first revolution and runs great. Well last week I parked it on a small hill with its nose facing down hill for a couple of days. Now I can't get it to start at all. It will spin and hit one or two times with lots and lots of white smoke. I checked the oil level and its right, I pulled the plugs and they had some oily moisture on them so I put in new ones, I checked the fuel flow and it is getting into the carb and drains out the bowl with a good flow and it still won't start. I can't figure this one out for sure. There is some oil that looks like it came from under the manifold to head connection after I crank it a few times. All I can figure is that the nose down allowed some oil to get past the rings or valves and is causing some sort of problem. Also when I removed the spark plug on the non flywheel side, when i pulled it out, I heard a suction sound. Not too loud just like popping a cork.
Any ideas? Thanks
 

I suppose it may have sucked some oil out of the air cleaner...?

IF the Air Inlet tube is restricted, oil will be sucked from the Governors, into the Intake..

Ron.
 
I pulled it to a level spot to try to start it and work on it. I'll try the moisture and air cleaner check to see if I can get it it run..
Thanks
 

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