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Cracked swingarm (Read 297 times)
Phelonius
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Re: Cracked swingarm
Reply #15 - 05/16/09 at 14:39:58
 
marshall13 wrote on 05/15/09 at 20:57:01:
Phelonius wrote on 05/13/09 at 14:44:55:
Yeah, If you only do two wheels, you have nothing to worry about although I still think mounting footpegs on swingarms should have gone out about 1970 like it was supposed to.
I like Marshalls' idea of pointing the ends of the box. It makes a lot of sense. Had I thought of it, I would have done it. It only entails two more cuts with the band saw on each end.
After 20,000 moles on the first one, I am not very worried about this one. I think that since the end of the box is so close to the axle aft and there is not much length of leverage forward, so I think it will be strong enough. One eighth of an inch thick metal is thicker than the original swingarm so shge is hell for stout.
The extra weight doesn't bother me when I consider the weight of the sidecar anyway, and I don't race.

Phelonius

absolutely right abought the pegs.... and if they HAD to do it, they shuld have at least added a reinforcing sleeve(like the "frame nuts" on older bicycles, those old ones were pointed for a reason)... honestly wish i could take credit for the points idea, but i learned it the hard way almost 3 decades ago... i patched a cracked trailer frame about 5 times before the guy across the alley asked me if id like to fix it right once, or was it a hobby?.....gotta love new yorkers... he explained about the stress riser, and told me to cut my patch football shaped... needed a new hobby after that one went on....lol  


The Savage swingarm footpeg mount does have a re-inforcing sleeve but the twits didn't fully weld it and they squashed the arm at that point.
These are the start of the hairline cracks I experienced.
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ls650v
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Re: Cracked swingarm
Reply #16 - 07/24/25 at 01:21:50
 
Bump.

My swingarm cracked in the same place.  Just replaced it with a salvage yard item.  37,995 miles.  Frightening and disappointing at the same time.
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Re: Cracked swingarm
Reply #17 - 07/27/25 at 11:15:19
 
These swing arms positively need to be properly jigged at both ends before before cutting or welding. Save yourself a headache. I put mine in an oven twice after I was done and then removed jigging the next morning. All in an effort to give the metal a new memory. Some crack some don’t , I keep a spare around just in case. What side did it crack ?
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ls650v
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Re: Cracked swingarm
Reply #18 - 08/02/25 at 00:06:09
 
Left side
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Re: Cracked swingarm
Reply #19 - 08/02/25 at 12:30:28
 
ls650v wrote on 08/02/25 at 00:06:09:
Left side


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ls650v
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Re: Cracked swingarm
Reply #20 - 08/03/25 at 03:27:46
 
This is the best I can do to provide an image.  The crack extends from the top of the swingarm to the bottom of the swingarm around the outer perimeter.

https://drive.google.com/file/d/1E-E0_Bh9JTW4COZ_wzpgv8IhZpT1mlMC/view?usp=sh...

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« Last Edit: Today at 00:53:53 by ls650v »  

Swingarm_crack_cropped.jpg
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ohiomoto
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Re: Cracked swingarm
Reply #21 - 08/04/25 at 18:11:46
 
There is another thread with a more cracked swingarms.

http://suzukisavage.com/cgi-bin/YaBB.pl?num=1624400028/8


This one was mine.  
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Re: Cracked swingarm
Reply #22 - 08/04/25 at 18:50:57
 
Oh, cool. A new fear's just unlocked....  Shocked
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J Mac
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Re: Cracked swingarm
Reply #23 - Yesterday at 19:06:13
 
A 16-year bump!  That's impressive.  I like it a lot.

ls650v wrote on 07/24/25 at 01:21:50:
Bump.

My swingarm cracked in the same place.  Just replaced it with a salvage yard item.  37,995 miles.  Frightening and disappointing at the same time.

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