Repairing an aluminum swingarm - Ducati.ms - The Ultimate Ducati Forum
  • 1 Post By duc96cr
  • 1 Post By ducvet
  • 4 Post By duc96cr
 
LinkBack Thread Tools Display Modes
post #1 of 7 (permalink) Old May 18th, 2017, 5:31 pm Thread Starter
Senior Member
 
psyopper's Avatar
 
Join Date: Nov 2014
Location: Beaverton, Oregon, United States
Posts: 371
Garage
Repairing an aluminum swingarm

Looking to get some insight from the more experienced people here.

Today I had a sprocket nut back off of the carrier stud on my rear wheel. It machined a nice gouge into the swingarm that happens to line up with the weld where the box section meets the adjuster block. Pictures are worth thousands of words, see the attachments.

One of the local smaller custom motorcycle shops said they could weld it, but they were afraid of structural integrity and the need to re-anneal the swingarm after the repair. There are a few shops in town that may be able to do the annealing, or he thought possibly baking it in an oven at 425F for a few hours and letting it naturally cool might also suffice.
My questions are
1. Structural integrity after the repair, should I find a different swingarm?
2. Is annealing necessary, and can I do it in my oven?
3. If I bake my swingarm to anneal it, will it burn off the finish on there?

4. When I break the chain, do I do it at the master link and replace the master? Or do I do it opposite the master and add a second master link?
Attached Thumbnails
Click image for larger version

Name:	unnamed 2.jpg
Views:	85
Size:	43.0 KB
ID:	818617   Click image for larger version

Name:	unnamed.jpg
Views:	89
Size:	70.0 KB
ID:	818625  

1994 Ducati 900 SS/CR

It's Italian. If I can get it to start, it'll win.
psyopper is offline  
Sponsored Links
Advertisement
 
post #2 of 7 (permalink) Old May 18th, 2017, 6:10 pm
Senior Member
 
Join Date: Jul 2010
Location: Grass Lake, Mi, USA
Posts: 3,538
Images: 4
No, No, Yes, at the master.
jahjah likes this.

'96 Ducati SS900CR, '07 S4RS, '06 Busa, '77 Bonny,
'00 Superglide, '85 Sportster, '78 SR500
duc96cr is offline  
post #3 of 7 (permalink) Old May 19th, 2017, 11:23 am
Senior Member
 
ducvet's Avatar
 
Join Date: Dec 2007
Location: lakes region, NH, usa
Posts: 2,002
Images: 1
I have seen many swingarms repaired with no issues just like yours. Get a competent welder to do the work and you will be fine, That said I do keep an eye on them after but have seen no failures to date.

Yes the clear paint will burn off so you will want to clean it up and re-clear or just let it get a patina.

Break the chain at the master and put on a new rivet style link.
jahjah likes this.
ducvet is offline  
 
post #4 of 7 (permalink) Old May 19th, 2017, 4:26 pm Thread Starter
Senior Member
 
psyopper's Avatar
 
Join Date: Nov 2014
Location: Beaverton, Oregon, United States
Posts: 371
Garage
Dropped it off with a welder that does a good amount of motorcycle work, and am having a pair of spool bungs added while he has it. We'll see what it looks like next week.

1994 Ducati 900 SS/CR

It's Italian. If I can get it to start, it'll win.
psyopper is offline  
post #5 of 7 (permalink) Old May 19th, 2017, 5:35 pm
Senior Member
 
Join Date: Nov 2015
Location: Portland, OR, USA
Posts: 361
First of all, that question could not be technically answered without knowing the material specs. However the previous two replies work for me since I have done plenty of them.

My advice to your welder if the work is new to him, preheat to 350F- ish in an over or with a torch, and after welding, either place it back in the oven and decrease the temperature over time or what I generally do, wrap it in a fiberglass welding blanket and it will cool slowly over a few hours. By doing these two things, you will reduce rapid expansion and shrinkage by a significant percentage reducing the potential for micro cracks.

Another tip is that whenever possible provide your welder with the same material or a scrap part, so that he can perfect his setup. Even the very best welder will appreciate that. It's a stressful experience for any welder when he only has one chance and the part is expensive or not replaceable. Then when you pick your part up, you won't get a story about how the last guy that used the welder didn't tell him there was a problem with the welder.

I try to be thorough. I rarely return to a thread. If you have a question for me, PM me.
2001 Monster S4
jahjah is offline  
post #6 of 7 (permalink) Old May 20th, 2017, 9:31 am
Senior Member
 
Join Date: Jul 2010
Location: Grass Lake, Mi, USA
Posts: 3,538
Images: 4
Most welders take advice just about like my wife does.

'96 Ducati SS900CR, '07 S4RS, '06 Busa, '77 Bonny,
'00 Superglide, '85 Sportster, '78 SR500
duc96cr is offline  
post #7 of 7 (permalink) Old May 20th, 2017, 6:38 pm
Senior Member
 
muddy60's Avatar
 
Join Date: Sep 2012
Location: Sunshine Coast, QLD, Australia
Posts: 396
Quote:
Originally Posted by duc96cr View Post
Most welders take advice just about like my wife does.

'95 900 SS - one day a Café Racer!
muddy60 is offline  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Ducati.ms - The Ultimate Ducati Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Similar Threads
Thread Thread Starter Forum Replies Last Post
Wanted: m900/750/888/851 aluminum swingarm adjusters bohalranipol Parts and Accessories 1 May 3rd, 2017 11:24 am
Bearings in S2R/S4R swingarm, possible ? George 996CR Tech Forum 0 Apr 13th, 2017 3:25 am
FS: aluminum swingarm for '92-'98 supersports nine16 Parts and Accessories 0 Mar 19th, 2017 1:11 pm
Another Aluminum Swingarm Crack CCM900 Supersport 14 Jun 1st, 2016 3:30 pm
Ducati Monster, SS, 851, 888: OZ Motorbike Piega Forged Aluminum Wheels moto Motowheels 0 Apr 7th, 2016 8:33 pm

Posting Rules  
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome