been there done that. doesnt work

 

long jack handle slipped over your breaker bar

 

The way we have been doing it: Put a thick wooden dowel (like a coat closet rod; about 1 1/2 to 2" thick or more or a 2 by 4 on it's edgebetween the rear wheel & swingarm, then use a long breaker bar to loosen it. They tighten the crap out of it from the factory. You will compress the suspension and it almost feels like something will break but it will come loose. Also spray it with WD-40 or Liquid Wrench and let it soak before removal. Also, make sure the lockwasher is flattened first.