A four stroke radial fires every second cylinder in a row but I would think a two stroke radial would have to fire every cylinder consecutively. Notice to that radials are always composed of an odd number of cylinders, 3, 5, 7, or 9 for smoothness.
Here’s some links showing how they work.
http://science.howstuffworks.com/transp … ngine2.htm
https://www.youtube.com/watch?v=z4Dg7JuH-48
https://www.youtube.com/watch?v=f8sA5_AX_eg
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