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:thumbup:

If you mean right at the beginning of the video, then no, that's not four stroking. Four stroking is observed at full rev without load. I'm not sure why that vid is titled the way it is. To my ear, it's not obvious at any point that the saw is four stroking. I could be wrong, my ears are not...

This is good for tuning info, and has a couple of sound clips, including the four stroking point. http://www.madsens1.com/saw_carb_tune.htm

I'd call the four stroking sound a burble :). Madsen's. http://www.madsens1.com/

Sounds like you have the idea about right...I believe there are vids online with audio that demonstrate it, if you want to try to locate that resource.