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little remote control aircraft engines spin up pretty high too, as with most other rc type toys ;)

hey Treeaddict, Just go back and re watch the video again and again, listen for the differences, you will begin to learn to discern the difference in sound, its there and clearly in the vid, you just dont know what the small differences are at the moment, so tune with the tach for now and go by...

OK. yes, the 9k ish or there abouts is what to expect when the saw is cutting. But dont mess with your H adjustment to get that when the saw is cutting, your just chasing your tail if you do. Far too many variables to use that as help for tuning, ie how long is the bar, what type of chain, what...

The spec sheet is not showing unloaded max rpm, but where its max power and torque is under load from a correctly sharpend chain.

Hmm, I would not go wide open throttle on a cold saw, not good for it at all. let it warm up, same with letting it cool off a bit after long cuts, dont just stop it after its been working hard, let it idle for 20 or so seconds to let it shed some heat, its good for the coil and the piston...

Some coils will limit the max rpm by cutting spark so the saw wont over rev, pretty much most new saws have them now. Unlimited coils require the correct mixture on the H jet to limit the max rpm. So tachs that cant read the limited coils will show a garbled reading once the limiter starts...

Do the saws you want to check have limited coils, if so, you need to factor that in, like the stihl edt7 on wards read limited coils. I have an oppama PET-2000DXR https://www.oppama.co.jp/tachometer-eng it reads fine without the wire, just place it near the sparkplug on the top cover, and it...