Chain rubbing against guard!

[Guest]

The guy who had it before me owned the bike for less than 4000 miles total, in that time he rode it for a year or two, replaced the chain, had the chain break on him, got done with the hospital visits from that incident and put this chain on it. That was about 3 years ago, but only a couple thousand miles of riding.

Then again, this is the same guy who had it in for $300 worth of carb work done 3 times in 4 years and still complained that 'it would only start on ether'. So I shouldn't be shocked that his new parts are wearing out.

Glancing over the receipts which came with the bike, it looks like he got a DID 630K X 96 in 8/2010 and then a Forward Motorsports FS-630HO-96 in 6/2011. I assume the FS chain is the one on the bike and the DID is the one that broke on him, but that is just an assumption.

And now you can see part of why I had to get the bike away from this kid before he ruined it completely.

He broke a DID 630 chain? Wow, I've been using the DID 630 on my bike since I've had it until I went to the 530 conversion. Never broke one, just wore them out. Roughly got about 12K on one before it needed replacement.

 

[Griffyn]

I'm assuming that his backward front sprocket and other such mischief caused the DID chain to rub on the metal backing plate for the chain guard and it wore away the rivets on the chain until the inevitable occurred.

It's the only way I can reconcile his story with the discovered facts.

 

[tkent02]

Nah, that wouldn't break it. Run it loose so it flies off will break it, or not installing the master link correctly, maybe using the wrong master link. There's not much else.

Judging from your attitude about the PO, I'd guess the master link.

 

[Griffyn]

Come to think of it, the FS chain has a master link on the receipt. The DID receipt does not. Sounds like he re-used the master link from the worn out chain. Could that have done it?

Although none of this changes the fact that the front sprocket was put on backward and may or may not have been a factor in the chain breakage.

 

[exdirtbiker]

I know someone that put a master link on facing forward instead of backward... clip and plate fell off, and 1/2 of the chain got stuffed into a super-clean 1975 CB750 case.

 

[jbird7262]

Yes, the "foam" is stock in the 750's, my 80' has it, it also looks like your front sprocket is missing the lock washer, also check your owners manual for the proper mounting of the front sprocket, some years have the 3 counter sunk screws facing inside towards the engine and some have them facing outwards towards the cover.