Mystery Sprocket

4 replies to this topic
  • Sinnedlucey

Posted May 28, 2014 - 06:42 PM



I have a 1999 yz400f and it needs a new rear sprocket. the problem im having is that neither of the parts stores in my area have a sprocket that has the same bolt pattern as the one i have. 

I measured the distance between the middle of two holes across from each other and got around 176mm. 

So ive checked parts stores and can find nothing online. should i try to get a sturdy looking sprocket and try to drill my own holes? 

I dont really want to buy a whole new wheel or hub just because i cant find a sprocket...

  • Beau 88

Posted May 28, 2014 - 07:02 PM


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  • gimped up

Posted May 29, 2014 - 12:44 AM


Are you sure the rear hub is yz400 hub?
Or does it have a mystery hub and wheel?
A picture would help.

  • KJ790

Posted May 29, 2014 - 04:43 AM


If it is a 99 YZ rear hub then it should use the same sprocket as any other modern YZ. Yamaha hasn't changed their rear sprocket dimensions in almost 2 decades.

  • grayracer513

Posted May 29, 2014 - 06:28 AM


It's not a YZ hub, that's your problem.  A YZ has a bolt pattern of 6 holes on a 150mm circle. 


Like KJ said, Yamaha hasn't changed that in since before '97 sometime.

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