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Discussion Starter #1
Ok, a while back I expressed my beef with the 520 chain mod.
My original concerns were that it was showing increased signs of wear, stretching most notably.

Now there's this, a busted roller at the master link.
Temper your enthusiasm with the knowledge that I always lube the chain, and it is now garbage with just over 3000k miles on it. Mostly commuting miles.

As a matter of fact I spotted this while I was cleaning and lubing the chain when I got home from work.



 

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ORLY!?1?
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U must be bustin them mad wheelies yo...

No seriously good thing you caught it. Do you just have to replace that master link or what?
 

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Discussion Starter #6 (Edited)
DSUde this happens once in a blue moon and you only need to replace that link. Every motorcycle shop should or could get you one quick. But yes that f-in sucks!
Yeah, I thought of that but I wasn't a fan of the 520 for the 51 anyway, so I already ordered a 530 kit in 15/41.
I'm not having some one grind on the chain to shorten it, even though its stretched now. Or add a new section and/or another master link.
The chain as a whole is damaged.
 

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Wow, that's some crazy chit.

The only problem I had with the DID 520 ERV3 is the O-rings coming apart on a few links and the over all chain had very minimal stretching. But this is really scary.

Let us know if you ever find out what may have caused this potential catastrophe.
 

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Yeah, I thought of that but I wasn't a fan of the 520 for the 51 anyway, so I already ordered a 530 kit in 15/41.
I'm not having some one grind on the chain to shorten it, even though its stretched now. Or add a new section and/or another master link.
The chain as a whole is damaged.
Well if you would have bought your parts from me I not only could have gotten you a great deal but I might have been able to get it replaced for free. :rolleyes:

I have been running 520 kits for the last 15 years on everything I own and no problems even on the RC51.
 

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I'm running the same chain this year. :eek: Could a small rock do that if it got jammed between the sprocket and chain? Ive never seen that happen to any chain before. Just great, now I have to watch my master rivet job (first time) and the rollers too. Thanks for posting.
 

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Shane RC51
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My first thought was "who installed the chain"? It's odd that of all the rollers on the chain, the one that breaks is the end link. I'm thinking that whoever cut the chain damaged that roller initially. I'm especially thinking that's the case because you said you're not having someone "grind" the chain to shorten it. Don't get me wrong, I've used a grinder many times to cut links with no problems, but the proper way is to use a $15 chain breaker tool...

Oh, and your chain is not garbage. You can add another link and run 2 master links. You're not racing in AMA, just commuting. You'll have no problems. Do you still have the extra links that were cut off to fit the chain when it was new? Use one of them. I'd be more worried about what damage was done to my sprockets. Doesn't look like much. I'm guessing you're ok...
 

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It's difficult to be sure from the picture but it appears as if the o-ring is missing from that end of the master link. Maybe the installer forgot it and that let the roller bind more?
 

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Discussion Starter #13
It's difficult to be sure from the picture but it appears as if the o-ring is missing from that end of the master link. Maybe the installer forgot it and that let the roller bind more?
I noticed that too, and wondered if it was destroyed in the process.
I never noticed missing O-ring before, but it is a possibility I didn't spot it.

I'm pretty attentive to my chains though, I've even spotted cracking O rings on stock bikes I've bought used in the past.
 

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Discussion Starter #14
Well if you would have bought your parts from me I not only could have gotten you a great deal but I might have been able to get it replaced for free. :rolleyes:
Seems its always 20/20 but in the future I'll keep you in mind.

I have been running 520 kits for the last 15 years on everything I own and no problems even on the RC51.
You know I have too on pleanty of bikes but I'm still over here scratching my head.
Its a puzzle isn't it?
 

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Shane RC51
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It's difficult to be sure from the picture but it appears as if the o-ring is missing from that end of the master link. Maybe the installer forgot it and that let the roller bind more?

Yeah, I'm seeing that, too. Did the lack of o-ring lead to the damage? Or did the damage kill the o-ring?

IT'S A MYSTERY!!!:eek:
 

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Discussion Starter #16
My first thought was "who installed the chain"? It's odd that of all the rollers on the chain, the one that breaks is the end link. I'm thinking that whoever cut the chain damaged that roller initially. I'm especially thinking that's the case because you said you're not having someone "grind" the chain to shorten it. Don't get me wrong, I've used a grinder many times to cut links with no problems, but the proper way is to use a $15 chain breaker tool...

Oh, and your chain is not garbage. You can add another link and run 2 master links. You're not racing in AMA, just commuting. You'll have no problems. Do you still have the extra links that were cut off to fit the chain when it was new? Use one of them. I'd be more worried about what damage was done to my sprockets. Doesn't look like much. I'm guessing you're ok...
No grinding or cutting on installation, but I do recall the guys struggling to get the pins on the master link through. It is a possibility it was damaged during the installation. I had it done while in Italy at a little shop that mainly replaces chains and tires.

I like your theory though, its a good bet it could have been damaged during installation.

I'll talk to Scott about reparing it. Scott check your pm box.
 
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