Well, here's my 2 cents. This is a good illustration of what "rich" is. A couple of years ago I was breaking in a new O.S. 45 FSR (was a lucky find - or so I thought) running it rich but NOT 4-cycling because it was an ABC (nickel plated, actually) engine. Within a few minutes I heard a funny noise and noticed it loose RPM. I brought it to idle and revved it up a few times to get a close listen to it and then shut it down in confusion. What the heck went wrong? Well, I took off the backplate and found that the rod bushing at the big end spun. It didn't stick to the crank pin but there were aluminum shavings everywhere, even in the combustion chamber! My first fear was that I scored up the nickel plated cylinder. But when I diassembled the whole motor I found that there was oil everywhere and all the shavings were suspended in it. There was not one scratch on anything! Not even the top of the piston! Fortunately, I had another connecting rod so I cleaned everything up, even the bearings (had to remove them and flush 'em out with soapy water) and when I put it all back together it ran like a champ. Should never have sold that engine!

So, when the manufacturer tells you to run it rich or "greasy' when breaking it in it doesn't necessarily mean the engine has to be running rough or 4-stroking. A rich 2-cycle passes plenty of oil through the engine. Well, unless you got a Fox .35