my 60 would do that, turned out to be a bad seal on the oil pump itself, it would leak oil into the bottom cylinder(oil pump mounted lower on a 60), when i went to crank it, it sounded like the starter was bad or the battery was low, once it fired up, it would kill mosquitoes for miles around. Let it sit for a few days, pull the plugs, see if oil spews out of one hole(#2?), it would probably leak down thru the sealing rings as well, so don't be surprised if it comes out of all the cylinders. I ended up replacing the oil pump with another one, it fixed the problem
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