limited coil on 3120

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I have in my possession two 3120s right now, both saws are recent EPA versions. One has had the coil and flywheel swapped to the black setup the other the stock green coil.

Here's my question: Anyone suggest a really simple way to compare top speed ignition timing between saws to see if Husky really did slightly advance the lower limited setup?

I don't really want to have to find TDC, etc on the saws or spend a lot of time on it as I'm pretty busy right now. Maybe pop the top cover on each and use a non adjustable timing light (that's all I have) to somehow assess how the timings compare? All I'm trying to do actually is see whether or not the "final" timings are the same or not.

Seems like you clever folks out there might have some simple approach.
Bringing this back .......
Any updates or answers ?
 

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