JB Weld and exhaust

[DGXSER]

As the thread title implies, I am considering using JB weld to patch some holes in my exhaust on the SG. I have not yet found someone to weld up the holes, thought of renting a welder and learning then fixing the exhaust, but with a stock system I would hate to blow the holes out bigger and ruin it.

Anyway, will JB weld hold up to the temps it would see in the muffler areas of the exhaust?

[wingnut]

I have used it to seal patches held on with pop rivets and it has held up well. Don't think it will stand up to not havering something mechanical to hold it in place.

[motoman]

It'll work temp. wise, but will soon rattle out even in tiny pinholes.

[Tat2demon]

I tried using it on an old van muffler. Not only did it not hold but the fumes from it burning off damn near put me in the hospital.

[rdmcguy]

exhaust repair

My Kerker 4 into 1 had an exhaust leak at the collector
that could not be reached with a welder so I mashed some
MSR Quik aluminum epoxy putty down in there as best as I could and
after about two hundred miles ..3 or 4 rides, all is well,
Long term Don't know yet.
Time will tell,
good luck..Joe

[D0wn5h1ft]

Just sealed my straight pipes with JB Weld and then painted them with high temp engine paint. Here's a picture, I'll let you know how it holds up when I installed them tomorrow afternoon:

[Tat2demon]

Well at least your on a bike and not trapped in a van when it tries to gas you out.

[MPittma100]

Exhaust Leak

The JB Weld will not cure this problem. Welding, as suggested, is the best idea. Better off brazing with a flame rather than electric welding. You can grind/sand/polish the brass flat and smooth and then spot paint if necessary.

[DGXSER]

Will MAP gas burn hot enough to braze it? I assume I need to ensure the chrome is gone to brace it.

[Schming]

Hi Don, here's a site, with a product I will be trying sometime, that may interest you :

https://www.muggyweld.com/

I have a rust through, about the size of a quarter, in the top of my SF's left muffler that I may use one of their products on.

[James England]

The steel is very thin and, unless you have a lot of experience of welding, you'll more than likely blow holes in the muffler the minute a welding rod touches it. Brazing might do it...

[MPittma100]

Brazing

Will MAP gas burn hot enough to braze it? I assume I need to ensure the chrome is gone to brace it.

I do not know the answer to that. I have only used oxy-acetylene.

[fredintoon]

- - - will JB weld hold up to the temps it would see in the muffler areas of the exhaust?

Hi Don,
maybe. Are you proposing to use JB-Weld just because you already have some?
So go for it, the worst that can happen is that it melts or perhaps just blows out again.
But there are tubes of goo specifically meant for patching exhausts, Halfords used to sell Gun Gum, Canadian Tire has an equivalent that I can't remember the name of and I'm sure your local parts store does too.
Best try one of them.

[James England]

Doesn't JB weld, cold cure, take temps up to 500C?

[natemoen]

There are "flame proof" epoxy puttys that you can get a tube of for under $5. I used some to plug some drilled holes in the end of an exhaust and it did not last. It soon broke and fell out.