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what causes this?

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ok so i arranged a lil ride out to Cold creek here near Las Vegas and although i took my YZF, i thought id ask how this happens:

:applause:

http://img.photobucket.com/albums/v217/gbalias/OffRoad/DSC03471.jpg

http://img.photobucket.com/albums/v217/gbalias/OffRoad/DSC03472.jpg

http://img.photobucket.com/albums/v217/gbalias/OffRoad/DSC03473.jpg

http://img.photobucket.com/albums/v217/gbalias/OffRoad/DSC03474.jpg

http://img.photobucket.com/albums/v217/gbalias/OffRoad/DSC03476.jpg

it was getting late, ad we were losing sunlight and on the way back to the trucks this kid on a KTM stopped and looked down. well, thats what we saw. we were in a place that was not accessible by truck so all but 2 of us went back to the cars before it got totally black outside. told the KTM to try and start walking the bike down the mountain as far as he could and we would later meet up with him with a 4x4. all went well, and i got home bout 10pm after that adventure.

but i have never seen a sprocket get ripped out of the hub like that. my guess is that the bolts were way over-torqued. it was just crazy. :thumbsup:

anyways, heres pics of location and bikes:

http://img.photobucket.com/albums/v217/gbalias/OffRoad/DSC03467.jpg

http://img.photobucket.com/albums/v217/gbalias/OffRoad/DSC03468.jpg

http://img.photobucket.com/albums/v217/gbalias/OffRoad/DSC03477.jpg

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Incorrect nut tension.

Lack of thread lock, but I have read some bikes have a ongoing problem once the bolts work loose a little.

Thats with bikes that have 4 or 5 bolts - not enough.

What no DRZ in the last pic

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If the bolts are not tightened properly this will happen. It can happen to any bike. It is stricty a maintenance issue. Poor workmanship. The nuts must be tightened, not the bolts. The internal hex is just to hold the bolt not turn it.

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Bolts came loose, common if you don't get them tight enough....

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Ummm???

nodrz.jpg

:thumbsup: hahahha

yea, i figured it was a bolt/nut issue. sad thing was that the bike wasnt even the kids who brought it! sux.

luckily no one got hurt. thats a serious safety issue if youre cruisin in 5th and it were to come loose and lock up the wheel.

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You can see the hub is broken where the bolts go. Would them being loose do that?

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The hub damage is from the last one or two bolts that were still holding "somewhat". The torque forces from the chain/sprocket caused them to "rip" out of the hub as opposed to the others that just fell out do to improper torque on the bolts. Thats an expensive lesson... Luckily it didn t end worse!

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I ,thought I saw something ,like this somewhere before, that the chain was too tight, and during the suspension cycle's ,it was binding ,and finally broke the hub. Just a thought ?? :thumbsup:

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Ummm???

nodrz.jpg

Sorry, I am so used to looking at my yellow one I just didn't see it.

I guess black = stealth :thumbsup:

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