I was a two-stroke guy until everything went four-stroke in the 1980s. I had a choice: I could either learn about four-strokes or go stand in a corner and pout. I figured both two-strokes and four-strokes burn the same fuel, mixed with the same air, and perform the same four essential power-cycle functions of compression, combustion, exhaust, and intake, so they are really the same engine, packaged in two different ways. So I got over the change and learned about cam-lobe center angle and airflow through ports with poppet valves in them. I learned lots of interesting stuff.