I ran mine on a beach for a short squirt using the 172 main. It ripped.
If you're worried, sacrifice a new plug. Do a 5 second WOT pull in 4th gear walking pace up a slight incline. Tear it out and then go home and cut the threads off to check for the black line around the base. I think you'll be plenty safe. IMO this needle if anything feels a touch lean at constant throttle just before it comes onto the pipe. Great off the bottom and great up top. It could also just be the bike preparing to cut loose.
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