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countershaft seal

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my son has a 2009 yz 250 2-stroke did a complete rebuild on motor  between the oil seal and countershaft bearing there is a hard seal cannot find it on on any microfiche son knocked it off table & cant remeber which direction it goes in  what is the purpose of this? is it just a spacer ? was one on his 2012 yz 125

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The collar, #26 on the transmission parts fiche, goes chamfered side in towards the bearing. The purpose is to transfer the clamping force of the countershaft sprocket nut to the inner race of the bearing so the shaft spins with the bearing and not independently of it.

Edited by bg10459
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its not the collar it doesnt go on the shaft it fits in the case between the oil seal and bearing 

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its not the collar it doesnt go on the shaft it fits in the case between the oil seal and bearing 

 

 

Hmmmm.....

 

 

nj94h9O.jpg

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The bearing goes into the inside of the case and the seal goes into the outside of the case. There's not supposed to be anything in between. It shouldn't be a bearing shield, because that bearing shouldn't have one. The seal does have a tension spring on the inside lip. Maybe it came off and that's what you found???

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should have took a picture if it  

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