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Dang... Thanks dude.

I do the same thing. The thing I can't figure out is what the heck it is. I wanna say that the pressure in the combustion chamber builds to the extent the piston is forced to make a double stroke, on the upward "throw" and then a double stroke on the downward, but I can't picture this. :|...

Agreed, but what Grendle described is called four-stroking, for reasons I don't understand. Not just normal, but essential... I'm pretty sure a saw with a stratified motor (as the 441 has) would blow-up without it.