Chain Adjusting Bolt Seized

Hello all, one bolt of my chain adjuster has seized on my WR250 and now almost refuses to move. I am worried about snapping it and having to do all the redrill and hard work that goes with that task. has anyone else had this problem and if so how did you overcome it? Any help is much appreciated.

heat it up with a torch. sometimes that will break the corrosion

I've had this happen too. I forced the old bolt out, repaired the thread with a helicoil kit and inserted a new bolt using antiseize on the threads.

I should have put anti-seize on the adjuster bolts on day 1.

does your swing arm have a hole on the side?
my 98 had that problem, put a bunch of liquid wrench in there, using a heat gun got the aluminum warm
the aluminum expands faster than the steel bolt so some leaked in
the patiently got a little movement, then more and got it out with no damage
lubed up two new bolts and replaced both sides, I used Maxima waterproof grease

Like 2premo said, those swing arm holes can let water in and accelerate corrosion on the part of the bolt that protrudes inside the hollow part of the swingarm. (I ended up using some silicon on the swingarm plugs to avoid that)
Some penetrating oil and some heat from a torch, you can leave it soaking over night, then more heat and slowly work the bolt some turn out, some in etc....

I recently prepared a bike a friend of mine bought new and one of my routines was to remove the new swingarm tensioner bolts and applied plenty of anti seize to them.

Cheers !