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Junior Member
Blew the O2 sensor bung off my header
First of all, I've been browsing this forum for nearly 2 years and am so grateful to have this as a resource. It has been very helpful in keeping my 05 xb12r on the road!
I searched the forum to try and find any posts dealing with a similar issue but couldn't find anything relevant so if this has been discussed before please point me in the right direction.
So on to the issue. Yesterday I was riding and went WOT to pass and noticed that my exhaust noise was significantly louder. I pulled over and inspected the bike to try and find the issue and I saw what turned out to be the O2 sensor sitting against the frame and the rear header. I loaded it up on a trailer and took it home and started removing pieces so I could get a better idea of what I was looking at. Turns out that the O2 bung with the sensor attached was blown off the rear header leaving a fairly clean circular hole in the header. I intend to remove the header and attempt to weld the bung back into place (buy a new header if I cannot) but I'm mostly concerned about what could have caused it in the first place. If I have that much back pressure in my exhaust system could there be some larger issue I'm unaware of?
I have the Buell race exhaust but it does have a small dent on the bottom of the muffler underneath the connection to the Y-pipe, but it doesn't seem large enough to constrict exhaust flow. If anyone has experience with this sort of issue or could help provide some insight I'd be very appreciative.
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While it's not exactly a common failure, it does happen. Clean it up, purge it with argon and weld it with 309 filler. The small dent will not affect the flow of the exhaust gas.
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Junior Member
Thanks for getting back to me. I guess I'll just weld it up, slap it back on and take out the bike.
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Senior Member
Last edited by 34nineteen; 06-30-2019 at 02:19 AM.
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Senior Member
That is funny ^^^^^^^^^^^^^^^^^^^^ !
Doesn't one have to disconnect the battery in order to weld or is that just with mig welding ?
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