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Let's see some photos of this mayhem!

He has the Nut off there is nothing that needs to be UNthreaded the bolt needs to be pushed/pounded/driven out of the swingarm/motor.

Mapp Gas would be best an exact temperature I do not.........If you don't know when to hot is too hot or feel comfortable with the torch I would stay with the let it soak and hope for the best method or phone in a expert or someone with experience.

Just an FYI - You want an impact WRENCH. Not an impact driver.

Do you have some pics if your issue? Taking a punch or extension and a dead blow hammer will knock that thing right out. Try an air hammer on a rag maybe

Had the same issue on a yz250. Tried everything and it wouldn’t budge. What worked for me was cooling then rapidly heating. Try packing some ice around the bolt area to cool it off, once the bolt is cold heat up around the engine case area until it’s warm and try beating it out. Might have to do it a couple times but that worked well for me multiple times.

Get an air chisel. Cut the end off of the chisel so you are left with a round end. Use the air chisel with the modified attachment to push out the stuck pivot bolt. I have used this method to easily push out a bolt that would not budge with a sledge hammer.

Deep creep is the best around!

Had same thing with a used yz125 I bought.Tried everything from heat to soaking in penetrate type fluids. Rang a mechanic freind and he just said flattley you have to bash them out. I ended up literally using a sledge hammer and had to swing fairly hard till it moved the first 50mm or so. Just be careful of miss hits, I put wood blocks around in case. He did suggest that if you grind the head off the opposing side they tend to come out easier backward. I saved my bolt by cutting the last two threads off as...

Youll have to use a screwdriver to sortof untwist it. It wont come out until you do. Once its straight you can pound it out.

The Nut is off it sounds like? so an Impact will do nothing...... you need to heat the engine case up because I highly doubt it is stuck the bearings which are pressed into the swingarm. I would keep soaking it while laying on it's side so it can run down inside and use heat as the last ditch effort, using heat is great if you are cautious and you understand the damage that could be done by using it.