Never

Perhaps you should contact the mfgr about that.

 

most racebikes use 520 setups so it's not that it couldn't handle the power....

i doubt all those teeth broke off at once, it had to have been a gradual thing but only 3K miles? i've never so much as seen a front sprocket waved, let along busted teeth. rear sprockets on the other hand....

i dunno.... why don't you call sprocket specialists and ask them? couldn't hurt...

 

Holy shit! Never saw even one tooth of on a cs like Andrew said. Even if you reverse mounted it the teeth shouldn't fly off. Like the other guys said, time to talk to the mfg. I'd be guessing you ended up with some very, very brittle stock in the cs somehow.

 

Can you post pics?? That seems odd...

 

+1 Please post up some pic's, :scared

 

sounds like the sprocket was made in kentucky. cause we have alot of people here with 17 teeth-14 broke and three perfect.lol

 

:lol :lol :lol

 

Have any of you guys stripped a sprocket? Its a 520 Sprocket Specialists 17 tooth, the whole chain kit only has maybe 3K miles on it. I did a burnout at a friends house and the chain started skipping. I checked it out and there are 14 teeth missing!! The chain wasnt loose, or too tight. They're snapped off and the other 3 teeth look perfect. Maybe it was a bad sprocket or I should'nt have abused a 520 set up on a 1000cc bike Oh well, its already done. Have any of you had this happen?

-Frankie

Oh shucks, here comes the 530 vs 520 wars again!!:biggrin

Was you on the track? I have been trying to tell everyone, if you are not running a full race bike, the benifits of the 520 are not present. But, the weakness of the 520 COMPARED TO A 530 ARE!!

On my racebike, which never sees the street, has a 520. My street bike has a 530.. But, I am an old geezer, what do I know! :crying

 

^^^ true to a certain extent but it all depends on how you take care of your setup... me personally I dont do burnouts on a loose chain nor do I ever do burnouts... its pointless since Im not a drag racer...

 

please post pics of the sprocket. i have never seen a front sprocket lose teeth before.

could be a manufacturer defect, or improper maintenance.

 

Post some pictures because i've called manufacturers and nobody can figure out what would cause this. Also post a picture of the rear sprocket because it's amazing the steel teeth off the front would come off and leave the rear sprocket teeth in tact? I've never heard or seen of anything like this and neither have the sprocket manufacturers. Get some pics and i'll send them out and see what I can find out...

 

Definetly post up some pics.. I have had this happen but not on a sportbike. Once on my ATV i tore a sprocket to pieces. Some are just made like garbage i guess. I bet its a defect in the product some way... I still to this day couldnt figure out how i did it on my quad either.

 

Idk what happened. The rear sprocket is fine, I'll take it off in a few mins and snap some pics. The teeth came off over the last 1000 miles or so cuz thats how long its been on the 1000. It was on my 06 750 before that and I installed it the same way as I did on the 750.

Heres the pics. Sorry for the blurry one, I was a lil too close it

This shows how it was mounted, even though its blurry you can still see that theres a lip on this side. The other side is smooth with no lip.

 

that's crazy:blink

the sprocket looks like it's damn near new except for the missing teeth

yeah, definitely wondering what the company has to say about it?

 

Here's the rear sprocket

 

can you post a pic of the rear sprocket from the side please?

 

if the nut came loose and allowed the sprocket lateral movement that would cause the teeth to snap.

Ive snapped front sprocket teeth once before and this was the reason.

 

damn you destroyed that sprocket. Maybe the rockwell was to hard and the teeth snapped due to the burnout? id be checking to see if maybe your alignment was off causing your chain to start skipping teeth

 

Was the chain and sprocket swapped all together? Did you mix new and used parts?

 

Wow, those are some crazy ass pictures. Never saw anything like that on a bike. Even nitro hillclimb bikes that caught a rock in the chain didn't blow teeth off like that. Keep us posted what the mfg says, I'm really curious what the hell would do that.

 

The chain and both sprockets were swapped together and they were all replaced together when I put them on the 750. The front sprocket nut was held on with red loctite.

I talked to Sprocket Specialists and they said to mail it in and they'll check it out. I also verified that the front and rear sprockets were installed correctly.

Anthony, you mean like this?

 

You shouldn't use the second rinse setting - its wasteful to the environment, unless of course you have sensitive skin that gets scratchy which then you should use a dye and perfume free detergent.

 

I know the fact of it being a 520 didnt matter. If anything the chain would've shown wear, not the sprocket. Maintenance would also show on the chain along with worn teeth and the teeth are fine.

 

I've talked to a few manufacturers and none have seen something like that happen. Maybe if the front sprocket wasn't heat treated and it slipped by or something, but it's very weird that alum teeth would be fine and even the chain but yet THAT many steel teeth are gone.

Add those teeth up and a high powered rifle can't shoot through that much steel. In fact there is so much steel there that the chain should have snapped way before that based on how much force it should have taken to do that.

this isn't about "wearing" out, but something massive and catastrophic happening. The cause is the key and not being heat treated is a possibility, but to be honest you have every other manufacturer scratching their head as well as they haven't seen it either.

Post up what Sprocket Specialists says about this. This is very weird.

 

that's crazy:blink

the sprocket looks like it's damn near new except for the missing teeth

yeah, definitely wondering what the company has to say about it?

The license plate explains it all

:lol but seriously, I'll definitely post up what they say when I hear back. I'm gonna try to ship it out tomorrow.

 

 

after seeing everything, i am guessing it was a manufacturer's defect.

if the front sprocket was torqued properly, and red loctite was used, and no teeth were sheared off the rear sprocket, and the rear sprocket doesn't show signs of extreme mis-alignment, i am guessing defect.

 

fftopic

Noticed we have the same washing machine! unk

I have seen some gnarly looking rear sprockets with broken teeth and others with teeth damn near warn flat.

Never saw a front sprocket look like that. I think Mummy's right. Somehow that sprocket got skipped in the heat treatment process.

BTW: I think the sprocket company owes you a new chain and sprocket set. Maybe a few extra sprockets to!

 

fftopic

Noticed we have the same washing machine! unk

BTW: I think the sprocket company owes you a new chain and sprocket set. Maybe a few extra sprockets to!

Sweet! :cheers

I hope they will replace the whole chain kit. That would be cool since I feel this wasnt my fault and I shouldnt have to buy a new chain and rear sprocket. I was sick all day today so I didnt get the sprocket out in the mail. Hopefully tomorrow.

 

WOW is all that comes to mind when i saw those pics.

Ya I'd say they owe you a full set. if they try to say they aren't giving it to you then play the how dangerous it could have been if you were riding it and it locked up.

Glad to hear you were only don't a burn out and not carving a corner or in a wheelie.


Did you find any shards of metal around the ground where you were? that scrap metal had to go somewhere. If it was instant then it should be around.

Goodluck

 

It wasnt a standing burnout, I was going around 25mph when I started blowing the tire off. It was banging the rev limiter for a hundred feet or so before I heard the chain start skipping so the pieces would be scattered all over the place!

 

I seen this happen to 2 differnt bikes this year, one on a 750 and other on a 1000.. from riders I know are always doing burnouts and pulling hiway wheelies.