Yz 125 shock is stiff

Nut off, washer off, use a socket extension or a rod to "tap" it through. If pounding is required you could mess up the threads.

Pounding:
put the nut back on a couple threads, use a smaller socket and pound until it stops, pull nut and follow above.
 
I bet you like it dry!

Put the impact on that bolt and get it spinning. That will loosen the rust. And like Steve said, lube it with a "penetrating" lube.

Yah, we get that!
I decided I'm just going to take be swing arm off and take everything to the dealership. I'm working now on getting the swingarm bolt put. I got it up to the point to where it's hitting the rear brake lever. I have to remove that now. I took a lot of penetrating lube and a 2 1/2 pound sledgehammer. Thanks for the help guys. I think I'm on the home stretch
 
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