Chainsaw Repair

I could dig and find longer videos but they won't have much more 4 stroking to analyze.

Thanks, but I think that is good and I'm not sure there is much more to see in it.  I have the one I did the video of where it was pig rich and 4-stroking all the time, except it cleaned up just at the greatest load.  Then there was the 2171 of your saw that was running clean except for a couple of brief 4-stroking moments.  Both looked the same in that you can see the 1/2rpm spike disappear as the rpm drops. 

It's all some neat stuff.I'm not so certain a high tech method of tuning a low tech item like a chainsaw would be something most people would do though ,interesting just the same

FWIW I deal with "rocket science'" every day .Robotics,PLC's,RFD tags ,ethernet .It's interesting but frustrating.I find it to be way more complicated than need be .On the other hand at work I get paid well to be frustrated

Yeah, I was not really thinking of it as a practical way to tune, more just trying to understand what might be happening to make it fire every other time as opposed to maybe every 3 or 4 times. 

And yeah, I'm busy as hell rushing a new product to market.  I just released the files for 5 new circuit boards, and we're starting to get delivery on the case parts, labels, etc.  It's really our first all new design using 3D rendering for the mechanical design.  Things get complicated as hell, and there are a couple of us who have been doing it for 30 years, and the damn parts keeps getting smaller as our eyes get worse.  Mostly I just want to use tools I can relate to like an axe - a chunk of iron on a stick is more my speed these days.