Changinf chain and sprockets

[Phenix_Rider]

I've tried a 1/2" breaker bar, mallet on the breaker bar, and a 1/2" air impact gun. Cannot get my front sprocket nut loose. I have someone holding the rear brake with it in neutral, so the rear wheel isn't moving. I made sure the washer is clear of the nut, sprayed it with WD40... I marked the nut with a permanent marker, and the SOB won't turn! With the breaker bar, I figured the suspension was compressing. With the impact, I can see the chain shaking. This thing is supposed to be torqued to 92 ft-lbs. The impact gun should have several hundred ft-lbs. I just tried again with a 3' length of pipe on the handle of my breaker bar, using a 6-point socket, with someone on the rear brake and the bike in first. That's a couple hundred ft-lbs at least. I turned the rear wheel, and turned the engine over! What is wrong here? Everything I've found, and my inspection of the threads says this nut is standard- left should be loose!! (counterclockwise)

What kind of king kong maniac with an impact wrench put this thing on?