All 2st Frozen Chain Adjuster Bolt

the chain adjuster bolt on my 1998 360 froze
had this happen on my 87 430, so won't make the same mistake again
this time I decided to be patient instead of breaking the bolt
so here's what I did
removed the plug in the side of the swing arm and put a whole can of penetrating oil in there
using a heat gun I waited for about 5 minutes and the bolt did not turn, kept going at about 9 minutes the bolt moved a tiny bit, left the heat on and began to wiggle it, pretty soon I was getting a 1/4 turn in and out so kept working that in and out
after about 15 minutes i was getting 2-3 turns in and out, kept working it till it was out
the aluminum threads look good and didn't have to drill anything or install an insert
this is in the 2 stroke section as it was one but will work on ANY bike
some don't have that convenient plug but most have a hole to heat vent the welding of the swing arm

a tip for the future
lube it every time you move it one way or the other and this won't happen

That's why I love my welding machines! (TIG and MIG)

Same thing happened on my WR, I just welded a small blob on the end of the bolt with lots of heat, and the heat did the job.
But if you don't have any welding equipment your solution will work fine