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Author Topic: What should I do? Big hole  (Read 1903 times)

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Offline jakec

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What should I do? Big hole
« on: August 14, 2019, 10:45:01 AM »
ay guys check out my big hole. Do you like it? The guys at the exhaust/welding place didn't like it.

This is the welded on muffler for pipe 2 on my CL350

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1970 CB750 K0
1977 CB750 Chop
1997 XR650L

Offline Deltarider

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Re: What should I do? Big hole
« Reply #1 on: August 14, 2019, 10:59:50 AM »
Try to popnail some thin metal plate on it. I mean, what else can you do? BTW, the hole looks like the typical weak spot that had its origin in a drain hole that had been clogged for too long.
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Offline jakec

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Re: What should I do? Big hole
« Reply #2 on: August 14, 2019, 11:17:32 AM »
I considered using a rivet gun as I'd seen that in other threads here, but this area is more of a complex shape, not sure I will be able to get any kind of seal that way. I was thinking about JB weld but I also read that it (and aluminum can) doesn't hold up
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1970 CB750 K0
1977 CB750 Chop
1997 XR650L

Offline Jonzilla

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Re: What should I do? Big hole
« Reply #3 on: August 14, 2019, 11:24:12 AM »
If it were mine I think I'd try the aluminum can and jb weld.  What do you have to lose?  Might get you by til you find a replacement.
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Online calj737

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Re: What should I do? Big hole
« Reply #4 on: August 14, 2019, 11:29:27 AM »
Drill a small hole at the end of the crack to prevent further cracking. JB Weld the crack. Thin aluminum or carbon sheet, heated to aide in shaping, then massage it into the shape needed. You can seal the edges with more JB, and wrap that pipe with exhaust wrap for best results (though it will look pretty ghetto and not really perform particularly well anyway. A new pipe is required.
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Offline jakec

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Re: What should I do? Big hole
« Reply #5 on: August 14, 2019, 11:41:52 AM »
A replacement isn't easy to find :(

https://www.ebay.com/itm/HONDA-CL350-CL-350-HM345-EXHAUST-HEADER-MUFFLER-TAILPIPE-SILENCER-PIPE/383093825712

I rode it with this hole for like 9 months because I had too many other projects.. Anyways now I've got another bike to ride so time to solve this.

What if I put a relief hole in the repair? Or would that defeat the purpose
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1970 CB750 K0
1977 CB750 Chop
1997 XR650L

Offline TurtleSnifferII

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Re: What should I do? Big hole
« Reply #6 on: August 14, 2019, 11:42:39 AM »
Looks nasty but atleast its not as bad as mine. My pipe for number 1 muffler was barely hanging in there. Their currently getting fixed at the chrome place.
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Offline jakec

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Re: What should I do? Big hole
« Reply #7 on: August 14, 2019, 11:43:48 AM »
Quote from: TurtleSnifferII on August 14, 2019, 11:42:39 AM
Looks nasty but atleast its not as bad as mine.

Hey, don't beat yourself up. the 650's are ugly that's for sure, but nothing to get down about ;)
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1970 CB750 K0
1977 CB750 Chop
1997 XR650L

Offline Don R

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Re: What should I do? Big hole
« Reply #8 on: August 17, 2019, 07:27:54 PM »
 I watched ebay like a hawk. I searched so often I noticed the new ads.
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Offline jakec

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Re: What should I do? Big hole
« Reply #9 on: August 26, 2019, 10:49:06 AM »
I have used JB weld "steel stik" with aluminum can as a backer to help span the hole. The steel stik is rated up to 300* F and 900 PSI.

I think it should be fine to withstand the pressure, we'll see about the heat. Maybe the heat cycles will make it dry up and fall off, we'll see. It was only $8!
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1970 CB750 K0
1977 CB750 Chop
1997 XR650L

Offline jakec

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Re: What should I do? Big hole
« Reply #10 on: September 04, 2019, 10:15:05 AM »
Well the JB weld came off today after about a week.
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1970 CB750 K0
1977 CB750 Chop
1997 XR650L

Offline nvr2old

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Re: What should I do? Big hole
« Reply #11 on: September 04, 2019, 09:28:27 PM »
If you didn't scuff up the chrome with something like 80 or 100 grit sandpaper, it won't stick for long.  It needs a bit of tooth to adhere to chrome.  I patched the underside of a 400F pipe with JB Weld and it worked well.
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Offline jakec

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Re: What should I do? Big hole
« Reply #12 on: September 05, 2019, 09:23:02 AM »
I did scuff it with 100, or around there (can't remember). I've purchased the "extreme high heat" JB weld and will try again.
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1970 CB750 K0
1977 CB750 Chop
1997 XR650L
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