Author Topic: If I can do this, you can certainly fix a crack  (Read 4389 times)

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Offline PetesPonies

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If I can do this, you can certainly fix a crack
« on: May 18, 2017, 09:08:01 AM »
I am taking the center part of the side cover from a 1976 or older, and putting it in the center of a '77/78 K side cover. This enables the use of the old style badges. Yes I know you can buy a decal that looks like the badges, but no. That is not the right way, IMO.Anyone can have that.
My bike is a '77 F and I wanted it different.I decided to skip some work and frustration buy just using a K cover from my year bike rather than adapt an older cover. These covers are made from ABS. Lots of automotive pieces are as well. ABS is a thermoplastic, meaning it can be melts. That is in different than thermosetting plastics which cannot be remelted, only degraded or ruined by excessive heat.But being it is a thermoplastic, this can be easily repaired or modified. You first start by welding the crack, or in my case the entire circumference of the piece I am adding. You weld with a soldering iron. You weld both sides. Then you use an ABS cement. Not a glue, not epoxy. That never works. If you have used that, it will eventually crack. You need a cement. Cement softens and dissolves the plastic. It is a chemical welding process. You cover both sides with the cement. The cement can be found in plumbing supplies. It actually contains some dissolved ABS in the cement. It will fill gaps if needed. It can be sanded, used to fill in more voids and finally treated as you would with any bodywork. here is where I am so fr in the process.











Pete's Ponies
Mustang RUSToration & Performance

Offline Scott S

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Re: If I can do this, you can certainly fix a crack
« Reply #1 on: May 18, 2017, 09:31:32 AM »
 That looks like my home state of South Carolina!
'71 CB500 K0
'17 Triumph Street Scrambler
'81 Yamaha XS650

Offline PetesPonies

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Re: If I can do this, you can certainly fix a crack
« Reply #2 on: May 18, 2017, 10:31:37 AM »
That's where I am as well Scott.
Pete's Ponies
Mustang RUSToration & Performance

Offline Scott S

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Re: If I can do this, you can certainly fix a crack
« Reply #3 on: May 18, 2017, 01:08:20 PM »
 Rock Vegas baby!
'71 CB500 K0
'17 Triumph Street Scrambler
'81 Yamaha XS650

Offline 754

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Re: If I can do this, you can certainly fix a crack
« Reply #4 on: May 18, 2017, 01:18:15 PM »
Great idea.
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Offline PetesPonies

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Re: If I can do this, you can certainly fix a crack
« Reply #5 on: May 18, 2017, 02:41:38 PM »
They should make someone "in the know" scratch their heads a bit  :)
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Offline seanbarney41

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Re: If I can do this, you can certainly fix a crack
« Reply #6 on: May 18, 2017, 04:43:03 PM »
They should make someone "in the know" scratch their heads a bit  :)
yep, they will wonder, "why do people have to hack the #$%* out of these old bikes?"
If it works good, it looks good...

Offline PetesPonies

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Re: If I can do this, you can certainly fix a crack
« Reply #7 on: May 18, 2017, 04:58:42 PM »
My work doesn't look like a hack job . . . .
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Mustang RUSToration & Performance

Offline BLAC

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Re: If I can do this, you can certainly fix a crack
« Reply #8 on: May 18, 2017, 05:36:25 PM »
They should make someone "in the know" scratch their heads a bit  :)
yep, they will wonder, "why do people have to hack the #$%* out of these old bikes?"

Change ≠ hacked to #$%*

If you can't fix it with a hammer, it's an electrical problem... If it's an electrical problem, it's Cal's problem.

*2005 Yamaha R6 (sold)
*2014 Ducati Streetfighter 848 (sold)
*2014 BMW S1000RR (sold)
*2010 Ducati Streetfighter S
*1978 CB550 Restomod Build
*1974 CB550 Monoshock build
http://forums.sohc4.net/index.php/topic,154614.0.html

Offline PetesPonies

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Re: If I can do this, you can certainly fix a crack
« Reply #9 on: May 18, 2017, 08:11:29 PM »
Sorry you can't appreciate workmanship or understand the benefit. I figured  providing this technique for people who might want to save a cover from an old bike, would be good. But being persistently  belligerent is so much easier to do. I often say (or think ) if a post doesn't interest someone, why must they interject? Inadequacy ?
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Offline seanbarney41

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Re: If I can do this, you can certainly fix a crack
« Reply #10 on: May 19, 2017, 03:10:36 AM »
sorry you can't take my comment with a sense of humor.  why do you take yourself so seriously?  Inadequacy?
If it works good, it looks good...

Offline BPellerine

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Re: If I can do this, you can certainly fix a crack
« Reply #11 on: May 19, 2017, 04:18:57 AM »
I think it is great when someone comes up with a new idea to fix old stuff,the common fix has been epoxies and other glues,or fibre glass,this looks like a fix that will last,there are a lot of cracked covers out there!bill
1978 CB 750K ard and webers
another anfob

Offline b52bombardier1

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Re: If I can do this, you can certainly fix a crack
« Reply #12 on: May 19, 2017, 04:47:52 AM »
I love the idea here and Pete's workmanship.  This is not much different than butt welding in a new piece of 20 gauge sheet metal on an old rusty automotive fender. And nobody complains about that.

Beautiful work, Pete.

Rick

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1971 School Bus Yellow Aermacchi H-D Sprint 350
1972 Candy Yellow CL100 K2
1972 Candy Jet Green Honda CB500
1973 Mighty Green ST90 K0
1974 Mars Orange CT90 K5
1975 Topaz Orange ST90 K2
1976 Shiny Orange CT90
2006 Honda Foreman 500 (restored)

Offline PetesPonies

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Re: If I can do this, you can certainly fix a crack
« Reply #13 on: May 19, 2017, 05:43:43 AM »
Thanks, yes this fix is very, no extremely strong. I have enough pieces left over I'll patch some together and do a 180 degree bend on it to show  :)  But that will be in a while. But I'll get to it.
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Mustang RUSToration & Performance

Offline Tom in Newcastle......Ontario

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Re: If I can do this, you can certainly fix a crack
« Reply #14 on: May 19, 2017, 05:57:34 AM »
"necessity is the mother of invention"

If you get a chance ,can you put up a pic of the Glue you used,the only stuff I know of is the yellow.....inhale get high stuff.. :P :P
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Offline PetesPonies

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Re: If I can do this, you can certainly fix a crack
« Reply #15 on: May 19, 2017, 06:29:50 AM »
It's not glue, it's cement. And the difference is the dislodging properties. As for a pic, can't right now. But the reason you know of yellow or clearish, is because you are talking about PVC cement. This is ABS. There isn't as much of it in the stores, but it's there. Just ask.
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Mustang RUSToration & Performance

Offline Tom in Newcastle......Ontario

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Re: If I can do this, you can certainly fix a crack
« Reply #16 on: May 19, 2017, 06:45:00 AM »
Ok, I will check it out,this is the stuff I use for ABS plumbing .
 
1978 cb 550k......stock,my first re-build


Loud pipes suck.......

If you buy something.........pay for it !
If you sell something .......ship it !
If you say you are going to do something......do it !
If you have a question about something......ask it !
When the seller answers ........let him know whether you still want it or not !
If you receive something .....let the seller know you got it !
If you get something and are happy/un happy with it .....let the giver/seller know !
If you have any kind of issue,shipping/receiving/quality/price/shipping charges etc !
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Offline JimJamerino

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Re: If I can do this, you can certainly fix a crack
« Reply #17 on: May 19, 2017, 08:33:10 AM »
This is a common topic in the Goldwing forums. There's a lot of plastic on Wings, so repairing it eventually becomes a necessity.

http://goldwingdocs.com/forum/viewtopic.php?f=5&t=35675

The second post in the thread gives a how-to on making an ABS "slurry" out of ABS filings and ABS cement, and using that to repair the damage using a similar method as Pete. Scroll down to see examples of the repair technique as it is used on a fairing.
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Offline Jimray23

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Re: If I can do this, you can certainly fix a crack
« Reply #18 on: May 19, 2017, 08:47:23 AM »
Sorry you can't appreciate workmanship or understand the benefit. I figured  providing this technique for people who might want to save a cover from an old bike, would be good. But being persistently  belligerent is so much easier to do. I often say (or think ) if a post doesn't interest someone, why must they interject? Inadequacy ?
Most likely. Lol

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Offline MauiK3

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Re: If I can do this, you can certainly fix a crack
« Reply #19 on: May 19, 2017, 09:47:31 AM »
Very innovative and cool. These great old bikes have a devoted following of talented people. This is a great community.
1973 CB 750 K3
10/72 build Z1 Kawasaki

Offline frodef2

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Re: If I can do this, you can certainly fix a crack
« Reply #20 on: May 22, 2017, 01:09:24 AM »
ABS glue/cement can be made by dissolving abs plastic in acetone.


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Offline PetesPonies

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Re: If I can do this, you can certainly fix a crack
« Reply #21 on: May 22, 2017, 06:23:46 AM »
Ok, I will check it out,this is the stuff I use for ABS plumbing .

Yes that is it. It has some dissolved ABS in it I believe. But only a few dollars has an applicator and last a long time. can't beat it. Weld the crack first, then apply the cement ( not glue ).
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Mustang RUSToration & Performance

Offline frodef2

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Re: If I can do this, you can certainly fix a crack
« Reply #22 on: May 22, 2017, 10:28:42 AM »
As stated. ABS "cement" is ABS plastic dissolved in acetone, or another solvent that can melt the plastic. See page 2 of this sds

http://www.homedepot.com/catalog/pdfImages/9a/9aeb944a-dc5a-45b7-8a2d-8f9e81a7fc54.pdf



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Offline PetesPonies

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Re: If I can do this, you can certainly fix a crack
« Reply #23 on: May 22, 2017, 11:17:47 AM »
There's MEK in it as well.
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Offline Tom in Newcastle......Ontario

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Re: If I can do this, you can certainly fix a crack
« Reply #24 on: May 22, 2017, 11:29:44 AM »
Ok, I will check it out,this is the stuff I use for ABS plumbing .

Yes that is it. It has some dissolved ABS in it I believe. But only a few dollars has an applicator and last a long time. can't beat it. Weld the crack first, then apply the cement ( not glue ).

 :)  Thanks
1978 cb 550k......stock,my first re-build


Loud pipes suck.......

If you buy something.........pay for it !
If you sell something .......ship it !
If you say you are going to do something......do it !
If you have a question about something......ask it !
When the seller answers ........let him know whether you still want it or not !
If you receive something .....let the seller know you got it !
If you get something and are happy/un happy with it .....let the giver/seller know !
If you have any kind of issue,shipping/receiving/quality/price/shipping charges etc !
Communicate