And instead of intake valves, there are ports in the cylinders, just like on a 2-cycle gas engine. But like PackardV8 points out, no pressurized crankcase or "reed valve" like on your typical chainsaw 2-stroke.
2-stroke diesels are really an ingenious design. This 'splaiins it pretty well:
http://auto.howstuffworks.com/diesel-two-stroke1.htm Skip the video, it's worthless.
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