Correct. It's two rings. One oil and one compression. ABove about 10,000 it runs better with a single ring.
Each pair of big ends is a different size to the other pair. It's the way that the press up crank was designed. It has tiny pork chop flywheels and almost no flywheel effect to speak of, so it dies if you let revs drop.
Compression is not very high and that allows it to rev to the moon. Ignition timing is very far advanced and is fixed - no advance or retard.
Def 2/10 wouldn't bang that. Yeah right....