Drilling out JB Weld from exhaust bolt thread?

[JTGS850GL]

An ez-out is harder than any drill bit. The only way I've found, and not always, is to bust up the ez-out into pieces with a chisel and pull the pieces out a piece at a time. It's one reason I NEVER recommend the use of an ez-out. It's a great way to run a minor problem into something major.

Looking at those pics it looks to me like the PO may have broken off an eazy-out in that hole. If that's the case, then you will never be able to drill it out. If the drill bit just slides along but doesn't bite then that would confirm my suspicion. JB weld is VERY easy to drill.

Oh man I never thought about that possibility. What makes getting an easy out out so difficult? Is it too hard for even a carbide?
Let's say that is the case. What do I do to prevent the header from leaking or being sealed properly?

[JTGS850GL]

Looking at those pics it looks to me like the PO may have broken off an eazy-out in that hole. If that's the case, then you will never be able to drill it out. If the drill bit just slides along but doesn't bite then that would confirm my suspicion. JB weld is VERY easy to drill.

[gsrick]

Hey guys,

My build is coming along, learning a lot about my bike and my abilities. I notice previous owner had jerry rigged a way to hold one side of the exhaust flange because the bolt snapped in the engine block. Boy I wasn't right, looks like they put JB weld in the threads. What should I do about this? Drill it out and helicoil?

https://i.imgur.com/fdIO3rc.jpg

https://i.imgur.com/JGr32xs.jpg

That's pretty nasty looking. If you think you can get a drill going in straight, that would be the ideal thing, but you may want to fill the rest of the hole with fresh JB to make a clean surface to start from. JB hardens up hard enough to tap new threads if you want to try that before going larger for helicoil.

[Kodak]

Hey guys,

My build is coming along, learning a lot about my bike and my abilities. I notice previous owner had jerry rigged a way to hold one side of the exhaust flange because the bolt snapped in the engine block. Boy I wasn't right, looks like they put JB weld in the threads. What should I do about this? Drill it out and helicoil?

https://i.imgur.com/fdIO3rc.jpg

https://i.imgur.com/JGr32xs.jpg