A coworker of mine pilots a '97 BMW F650.
He put a new DID 520 XRing chain and sprockets on at the beginning of the season (he commutes on the bike 100 miles round trip).
He was experiencing some drive line snatch, so inspected his chain last night.
I suggested he email/call DID to see if it is a warranty issue :pissed:
Here's a picture.
[image: Posted Image]
F650 DID XRING Chain failure This chain has 4k miles on it!
Any ideas what would cause this? Do you think it's a warranty item?
Wow. I have 24k on my oem and it's shagged, but 4k???
He's lubed it semi-regularly.
defective chain looks like, premature metal stress.
Is it me or do the links on this chain look flattened like it was touching something?
[image: Posted Image]
I agree with C.O.D. ... was the chain adjustment checked regularly and was the slack measurement set according to the manual?
Warranty it anyhow !
I agree. All adjustments were made to OEM specs. Not only are the plates flattened, there's a gouge in the plate above the middle pin.
DID says to contact the dealer, so Dave, the owner of the F650, is going to pull the front sprocket cover tonight, and start the replacement/warranty stuff tomorrow.
He's an everyday use the bike commuter like me, so I was shocked when he walked in today sans gear & helmet.
-t
Looks like something is not fitting right. He should figure out what caused the abnormal wear on the plates or he may be doing this again. I doubt a defective chain would do this. Looks more like a defective installation.
I would take a flash light and inspect the entire path of the chain.
It is obviously hitting something with quite some force. Chain failure may not be his only concern.
Hope he parked it...
Yeah, it's parked.
And will be until the chain is replaced. He said he noticed a noise the other day, and it felt like something was catching.
"Driveline snatch?" I asked.
Something just isn't right. I'm sure I'll have more pictures after he tears into it.
-t
If that damage is on the inside of the run--the side that contacts the sprocket--I would guess that the chain isn't well matched to the front sprocket.
The attached pic shows a stock 4th-gen VFR front sprocket that went about 24,000 miles with a DID chain. Note the indentations in the soft material on either side of the teeth. That is where the inner side plates contact the sprocket. If the BMW sprocket (or aftermarket replacement used with the damaged chain) doesn't provide adequate clearance for the DID side plates--or provide a soft surface as the Honda sprocket does--the chain's inner side plates could have just been hammered to death from contact with the sprocket.
OK. I can't figure out how to upload a frackin image to this fracking forum. Go look at your own sprocket to see what I'm talking about.
Looks like the damaged area was on the rear sprocket and there was some kind of impact there (backed into something that hit just the rear sprocket?, fall-over?).
Looks like the chain took a blunt blow and has been rubbing.
[image: View Post]y2kvfr, on Sep 16 2008, 12:17 PM, said:
"Driveline snatch?"
Can you post a picture of that?
Don't believe I saw this kind before :beer: :rolleyes: