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Old 09-25-2013, 04:17 PM   #11206
Uller
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Quote:
Originally Posted by Biped View Post
So i think the bolt failed first
Well, looks like I'm being outnumbered, and your picture is way better than mine.

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Old 09-25-2013, 04:24 PM   #11207
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..... I prefer plastics, they are the future.

Yeaah, we heard that before....

http://www.youtube.com/watch?v=PSxihhBzCjk

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Old 09-25-2013, 06:05 PM   #11208
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If I may ask would something like the Kouba Link which is machined and not cast help avoid this or because you use the sake bolt etc suffer the same malady

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Old 09-25-2013, 06:21 PM   #11209
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Quote:
Originally Posted by Uller View Post
Under typical conditions, such as bike/rider weight and normal riding, I believe this link to be under compression. Only when the front face of the wheel contacts a large immovable object pulling back and up on it, in this case the backside of a ditch, does the link come under a tensional force.

IMO, the broken link exhibits signs of a tension related failure that could only come from the link being pulled backwards (the tension) while the shaft inside the bearing, which is held in place by the bolt, remains fixed.

I'm still trying to wrap my brain around this, but isn't the link in tension at all times except droop?
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Old 09-25-2013, 06:32 PM   #11210
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I think you are correct, J. It would seem that if the comp on the shock was set too hard, and you had a high impact then the slowness of the shock response would put a higher tensile load on the linkage and hardware. The swing arm moves up, pivoting around the "rigid" shock mount and overloading the link pivot..
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Old 09-25-2013, 06:42 PM   #11211
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Quote:
Originally Posted by Biped View Post
I think you are correct, J. It would seem that if the comp on the shock was set too hard, and you had a high impact then the slowness of the shock response would put a higher tensile load on the linkage and hardware. The swing arm moves up, pivoting around the "rigid" shock mount and overloading the link pivot..
J. maybe I am looking at it wrong from a stress standpoint. I didn't really sit down and diagram it, was more just brainstorming here. It just seems improbable to me to have the bolt and link break from tension alone.

Biped, what you just wrote though is exactly what I was thinking happened in the initial hit. Maybe I didn't describe it properly before.
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Old 09-25-2013, 10:08 PM   #11212
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Quote:
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So i think the bolt failed first which caused the pin to scew in the frame by maybe 2mm. This out of alignment with the shock and swingarm created an elongation on the one side of the link which later failed, see arrows in pic. This fracture then rapidly propogated the length of the link resulting in what you see. I would assume the shaft was wedged in place after the failure before it was removed.
I think this sounds about right. After thinking about this over night here is what i think.

First of all if the bearing was to sieze it would cause the shaft/pin to rotate and the bolt also. By rotating the bolt you'd put a stressing load on the bolt which would cause it to break. After the bolt breaks the shaft/pin and the link itself gets wedged in between the fixing points as it is allowed to rotate slightly. If it gets wedged the joint becomes "fixed" causing bending loads on the link and breaking it.

There should be very little if any bending on the link as the swing arm holds the suspension in line.The link does not stabilize side to side movement.

As for the question how would the Koubalink help avoid this. If the failure is due to the bolt failing then nothing i would think. Also if you rode it home the koubalink would have bashed something else to pieces since it wouldn't break
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Old 09-25-2013, 10:14 PM   #11213
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Someone buy my touratech seat! I dont need it any longer. Selling for $500
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Old 09-26-2013, 07:13 AM   #11214
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I had the inserts in my airbox start to pull out so I fixed the problem by adding a bolt and washer from the inside and now use a nut and washer on the top side.

I also added some soft weather stripping to keep dust from getting into the airbox between the box and the filter.

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Old 09-26-2013, 07:47 AM   #11215
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Great idea...

This forum needs a "Like" button.
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Old 09-26-2013, 08:43 AM   #11216
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'14 690's

I know the US won't see '14s until March 2014 but I believe the rest of the world sees them sooner. Anyone in Europe or AU/NZ seen one yet or have any information on any small changes?
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Old 09-26-2013, 10:00 AM   #11217
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Great idea...

This forum needs a "Like" button.

Gawd...I sure hope not. Facebook kulture is a virus....please don't turn this site into some tapatalking zombie clone....PLEASE !!!!!
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Old 09-26-2013, 10:11 AM   #11218
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Gawd...I sure hope not. Facebook kulture is a virus....please don't turn this site into some tapatalking zombie clone....PLEASE !!!!!
But it's for the children.
(actually-thank you)
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Old 09-26-2013, 10:25 AM   #11219
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But it's for the children.
(actually-thank you)

Well, let the sandwich grabbers start their own forum and leave ADV to us big kids

Don't be so timid about thanking me.... just donate to My Baja Rescue Fund....(minimum taxable donations of $100.00.... )
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Old 09-26-2013, 12:05 PM   #11220
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Well, it looks like it is time for me to eat crow. I PM'ed CordR and asked about what the link looked like just after the impact and he sent me these pictures.

The link and bolt both broke at the same time. It does look to me like there is quite a bit of grease in the bearing still though so I don't think that this was caused by seized bearings but, what do I know....

(maybe I should have asked the question earlier instead of speculating Oh well....)



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