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Old 11-10-2012, 04:59 AM   #1
minime
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Default chain failure

A few weeks ago the original chain failed on my Tambo at a touch over 8000km.

With luck and skills I manage to stop safety.

With the help of Scott we manage to get the Tambo up and running again and ride it home without the need of a tow.

On further inspection the chain failed at 3 spots. See pictures.

We can't figured out how this happen, as the chain had the proper 6mm space and lube regularly.

On examining the manual, it states that the Tambo needs to change the chain at 6000km interval and 1000S and Ago at 12,000km internals.

Luckly the rear tyre didn't lock up as I was just exiting a corner when the chain decided to crap itself.

Notice the new chain a DID 525 ZVM-X which is noticeably thicker than the original DID 525. Thanks Ash for the prompt delivery.

Could be just a bit bad luck in teh manufacturing process - ie metal fatigue.

I'm sticking with the DID 525 ZVM-X even though its heavier than the original chain at least this should not happen again.

With the helping hand of MV Rick, a new chain, front and rear sprockets are on and the Tambo is ready for some summer riding.

Any thoughts why it failed!!

We think it could have been a rock that got lodge between the chain and sprocket.

BTW - The chain kinked after it failed as it chewed up my sprockets.
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Last edited by minime : 11-10-2012 at 05:09 AM.
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Old 11-10-2012, 05:59 AM   #2
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Mini...it looks as if the chain actually slid sideways on the sprocket...probably front(?) and the teeth of the sprocket cut the links. Perhaps something loosened up and jumped the sprocket?
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Old 11-10-2012, 12:51 PM   #3
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I think Chuck may have it right.
The evenly spaced damage looks like the chain was damaged by a sprocket. The damage continues on beyond the three circles, though it is less significant.

Two really good things to mention here. You were not hurt & you have great contacts & friends who can assist with the solution.
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Old 11-10-2012, 01:42 PM   #4
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Wow I've never ever seen a chain do that fella dam glad u managed to stop her ok with no damage to u or the tambo you where very lucky mate go out the lottery on
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Old 11-10-2012, 02:44 PM   #5
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Incredible, I have never seen a chain in that condition...ever...in 28 years of riding !
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Old 11-10-2012, 02:58 PM   #6
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Yeah, we couldn't figure it out as well. The picture is of the inner part of the chain. The outer part had only 1 broken link.

Luckly I was only doing 60-80km/h throttling out of a corner. Had I been hooting at a higher knots of speed, the outcome could have been different.
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Old 11-10-2012, 03:29 PM   #7
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I think you may have a good idea bout a rock or other object getting caught between the chain and sprocket. Seen a similar failure once before. It is damage, not material failure.
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Old 11-10-2012, 04:56 PM   #8
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Mini

I clean/ lube my chain quite often. Yours doesn't look as clean as a Tambo's should.
I do suspect some debris got up in the chain to cause such damage. Carefully inspect each tooth on the front/rear sprokets.

As I head into a 15K service next season, the chain will be replaced.

Thanks for the heads up.

Peter
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Old 11-10-2012, 05:18 PM   #9
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Wink 6,000km change?

minime;
any damage to the sprocket cover or cases?

something (my vote is metal) got between the chain and countershaft sprocket and lifted it onto the tips of the teeth thus the notches in the side plates
notice the bends in the plates on the other side? the chain was trying to go around the CS sprocket on its side

glad you didn't get hurt

the Tambo/Oro spec for changing the chain at 6,000km/3,800Mi is asinine period!

the original Regina Extra on the Brutale has 25,687km/15,965mi today and was last adjusted at ~8,000km/5,000mi when i increased the play a bit over the stock spec

my RSVR's Regina Extra started getting tight spots at ~46,600km/29,000mi

in Endurance Racing you see them adjust the chain?
http://www.youtube.com/watch?v=kNN5b2Unj6c

Bol d'Or 2012......one of my bikes won that race 3 times

good old #7 'the Freight Train'
http://www.google.com/imgres?q=godie...0&h=750&ei=Zt-
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Old 11-10-2012, 11:05 PM   #10
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The sprocket cover internals got a bit scratched up, nothing too be concern about, but the rear sprocket teeth got chewed up quite a bit.
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