Author Topic: If I can do this, you can certainly fix a crack  (Read 4397 times)

0 Members and 1 Guest are viewing this topic.

Offline PetesPonies

  • Hot Shot
  • ***
  • Posts: 270
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

  • Global Moderator
  • Really Old Timer ...
  • *****
  • Posts: 8,232
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

  • Hot Shot
  • ***
  • Posts: 270
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

  • Global Moderator
  • Really Old Timer ...
  • *****
  • Posts: 8,232
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

  • Really Old Timer ...
  • *******
  • Posts: 29,058
Re: If I can do this, you can certainly fix a crack
« Reply #4 on: May 18, 2017, 01:18:15 PM »
Great idea.
Maker of the WELDLESS 750 Frame Kit
dodogas99@gmail.com
Kelowna B.C.       Canada

My next bike will be a ..ANFOB.....

It's All part of the ADVENTURE...

73 836cc.. Green, had it for 3 decades!!
Lost quite a few CB 750's along the way

Offline PetesPonies

  • Hot Shot
  • ***
  • Posts: 270
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  :)
Pete's Ponies
Mustang RUSToration & Performance

Offline seanbarney41

  • not really that much younger than an
  • Really Old Timer ...
  • *******
  • Posts: 10,835
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

  • Hot Shot
  • ***
  • Posts: 270
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 . . . .
Pete's Ponies
Mustang RUSToration & Performance

Offline BLAC

  • An espresso is a
  • Hot Shot
  • ***
  • Posts: 694
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

  • Hot Shot
  • ***
  • Posts: 270
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 ?
Pete's Ponies
Mustang RUSToration & Performance

Offline seanbarney41

  • not really that much younger than an
  • Really Old Timer ...
  • *******
  • Posts: 10,835
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

  • Master
  • *****
  • Posts: 2,222
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

  • Hot Shot
  • ***
  • Posts: 536
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

Sent from my SAMSUNG-SM-N900A using Tapatalk

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

  • Hot Shot
  • ***
  • Posts: 270
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.
Pete's Ponies
Mustang RUSToration & Performance

Offline Tom in Newcastle......Ontario

  • Hot Shot
  • ***
  • Posts: 522
  • Newcastle Ontario
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
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

Offline PetesPonies

  • Hot Shot
  • ***
  • Posts: 270
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.
Pete's Ponies
Mustang RUSToration & Performance

Offline Tom in Newcastle......Ontario

  • Hot Shot
  • ***
  • Posts: 522
  • Newcastle Ontario
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 !
Communicate

Offline JimJamerino

  • Yay! I'm a
  • Hot Shot
  • ***
  • Posts: 265
  • Not rich enough to be "eccentric."
    • My CB650C build thread
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.
~ Jim

formerly "emperorspartacus"

There are old bikers.  There are dumb bikers.  There are no old, dumb bikers.

My CB650C rebuild http://forums.sohc4.net/index.php?topic=74212.0

Offline Jimray23

  • Hot Shot
  • ***
  • Posts: 306
    • none
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

Sent from my SAMSUNG-SM-J320A using Tapatalk


Offline MauiK3

  • A K3 is saved
  • Old Timer
  • ******
  • Posts: 4,282
  • Old guy
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

  • Enthusiast
  • **
  • Posts: 182
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.


Sent from my iPhone using Tapatalk
76' Supersport

Offline PetesPonies

  • Hot Shot
  • ***
  • Posts: 270
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 ).
Pete's Ponies
Mustang RUSToration & Performance

Offline frodef2

  • Enthusiast
  • **
  • Posts: 182
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



Sent from my iPhone using Tapatalk
76' Supersport

Offline PetesPonies

  • Hot Shot
  • ***
  • Posts: 270
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.
Pete's Ponies
Mustang RUSToration & Performance

Offline Tom in Newcastle......Ontario

  • Hot Shot
  • ***
  • Posts: 522
  • Newcastle Ontario
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