this shows the basic principle of a 2 stroke, note how the downward cycle of the crank forces the mixture into the cylinder (via the tranfer port, not too clear here due to the 2d nature of a picture).

Best 2 stroke how it works thing ever http://www.eric-gorr.com/twostktech/2techbasicprincipals.htm;

"In the crankcase the pressure is below atmospheric producing a vacuum and a fresh charge of unburned mixture gasses is flowing through the reed valve into the crankcase."

And there's the crank lube in the mixture. It has to be that way as you can't run a sump like a 4 stroke;


Normally the oil sits in a bowl just below the crank
sorry about the pushrod(!)

But far more elegant and never researched properly;



If the pictures don't work http://www.keveney.com/Engines.html is where they're from
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