Aerokroil might have helped. Now that it's a stripped bugger you'll want to find a specialist w/ an Elox machine.

 

When you say stripped header bolt, do you mean that the head is buggered up and it's frozen in place? Post some pics if you can.

Kroil is supposed to be the best penetrant/lubricant there is. You might want to step out of the box for a bit and find some before attacking this thing again.

 

I feel your pain and frustration, it's always the last one that holds you up too, tried some heat?

 

correct, it's where the exhaust pipe connects to the engine. it's an inline 4 engine (cb750), and each exhaust header has two screws. i managed to get the other 7 off, but this one is just stuck fast, and stripped now.

i suppose grinding the head off is an option, but im not sure i have the tools for it.

 

Elox? man, do you throw in the towel easy...

The guy is a long way from needing Elox.

 

working on uploading a picture...

 

Use a drill bit that is just a bit bigger in diameter than the screw, it will remove the head of the screw and you will be able to get the exhaust pipe collar off, then you will be able to grab the protruding part of the screw with vise grips.

If you use a left hand drill bit (as Dyna suggested) it may actually spin the stuck fastener out when the head of the screw comes off. You may find that after the head is gone and the collar is out of the way, that the remaining part of the screw is not very tight in the head anymore.

If Kroil is not available, try to find some PB Blaster, Liquid Wrench, or Automatic Transmission Fluid. Don`t bother with WD 40...

 

Grind of the head of the bolt, remove header pipe, take a small propane torch and LIGHTLY warm the area around the bolt,apply pressure with vise grips. I found this to work a lot of times. DO NOT over heat the head, just enough to expand the metal around the stud. Try to move the stud a little CCW then re-tighten, then CCW, then re-tighten, keep doing this until the bolt backs out. If you try to take the bolt out all at once good chance it will brake in the head. NOW you will need a machine shop. Good luck.

 

ok, hopefully this worked. attached should be two pictures of the screw in question.

 

that sounds like it may be my best bet. related question, and forgive my noobness: what should i use to grind off the head? i have a couple cordless drills and a corded 35000rpm dremel, but no idea what bits to use.