Serious Safety Issue on a 2009 Monster 696

[Curmudgeon]

i sort of want to say the rear wheel alignment was fudged on this one, with the dual sided swing arm, its important to have the axel going straight

A 796 is SSS. 

[wannabfast]

A 796 is SSS. 

the original post was about a 696....

[the_Journeyman]

Strange.  I do wonder what caused this!.  I have the same attachment method on my Duc, and it's got 36,000+ miles on the original oblong part that locks the sprocket in place.

JM

[mszilves]

I have a 796 also with 8000 miles on it. I also would like to know if they found a cause. I check my bike over regularly, and after reading this I went to look at the stock sprocket and everything looks fine, no sign of wear on the washer. But after hearing about two similar issues in the same thread, I'm a little worried, and would like to know if we have a root cause...

[Curmudgeon]

I have a 796 also with 8000 miles on it. I also would like to know if they found a cause. I check my bike over regularly, and after reading this I went to look at the stock sprocket and everything looks fine, no sign of wear on the washer. But after hearing about two similar issues in the same thread, I'm a little worried, and would like to know if we have a root cause...

I'm beginning to think that the wrong replacement sprocket was fitted, and this failure results from running the drive train out of line. I've had this mounting system on five other Ducatis I've owned and none ever had an issue. Would be nice to hear from Coffeebaron of course.

[Raux]

I have 16k kms on the bike. have run 15t (stock), 14t (bought from dealer in OKC) and then the 15t (stock) again. no issues, same mounting plate.

I think you guys need to look at wrong part or wrong install procedure.

[mszilves]

I'm beginning to think that the wrong replacement sprocket was fitted, and this failure results from running the drive train out of line. I've had this mounting system on five other Ducatis I've owned and none ever had an issue. Would be nice to hear from Coffeebaron of course.

You could be right...

I'm especially curious since I just installed the 14 tooth AFAM, which I noticed is missing the 1mm recess at the outside of the socket. (The stock 15 tooth has a 1mm recess where the washer sits). So with the 14 tooth face being flush, the front sprocket now sits 1mm towards the inside as compared to stock, which you can see on the chain guide. It's not excessive, and the insides of the chain links don't quite touch the middle of the top guide. Having read this thread, I wonder if 1mm of chain misalignment would be enough to cause the issue over time.

I like the way the 14 tooth feels much better, especially around the city. I'm going to get used to the new sprocket over the weekend and if I like it, I'm going to go with a 15/42 setup instead to keep the same gear ratio, but hopefully avoid any issues.

[Curmudgeon]

Are you sure you have the right one for the 796's? Mine has no recess but is from Driven Racing and I can't detect any misalignment. My chain pins definitely sit squarely on the center of the chain guide. Never realized before this thread that M and Hyper 796's were different and distinct because my dealer fitted mine from new, but that's pretty clear on the Monster Parts site. http://www.monsterparts.com/pc/52604d15/Chain-Sprocket/52604d15.html

[mszilves]

Are you sure you have the right one for the 796's? Mine has no recess but is from Driven Racing and I can't detect any misalignment. My chain pins definitely sit squarely on the center of the chain guide. Never realized before this thread that M and Hyper 796's were different and distinct because my dealer fitted mine from new, but that's pretty clear on the Monster Parts site. http://www.monsterparts.com/pc/52604d15/Chain-Sprocket/52604d15.html

Pretty sure I ordered the right one. It has Driven packaging, but I didn't realize the HM796 and M796 were different? Are you sure? Even the link you sent shows both applications. This is the one I got: http://www.ca-cycleworks.com/products/final-drive/front-sprockets/52608d-14-5366

It says OEM Euro sprocket, but should be the same. If you look at the sprocket, the front face doesn't have the recess like the stock one does. This recess is KEY. This will cause a 1mm misalignment. Is yours recessed like the stock one? I can't see from your link I can only see the backside of the sprocket...

[Curmudgeon]

Since you have the Driven packaging, the number on that should read 1067-525-14T. That's the one for the 796's. If you look at the link I sent, it shows 796 M/HYP and everything else.

Don't get hung up on the recess on the stock 15T. The machining of the Driven can compensate for that. You need to look at the chain run. If the pins of the chain are centered over the rib on the chain guide on the swing arm, you have no issue.

[ungeheuer]

I think you guys need to look at wrong part or wrong install procedure.

^^ This.

I'm another who ran aftermarket 14t sprocket on my M696 for 1000's of kms with no problems whatsoever.  

I agree with others though.... it would be nice to hear back from those who've had the problem and subsequently resolved it.........