06 yz450f oil seal

1 reply to this topic
  • -michal

Posted August 29, 2010 - 05:06 PM


I have a problem with my 2006 yz450f. I have oil leaking from the seal under the front sprocket. I replaced the seal however its still leaking. It looks to me that i have excessive pressure in the crankcase. Does anybody know what might be causing this problem?
Thanks in advance.

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  • grayracer513

Posted August 29, 2010 - 08:23 PM


The output shaft bearing is pressure fed, so the integrity of the whole sealing system is important. Common mistakes made in replacing the seal are:

  • Failure to replace a worn or damaged seal collar
  • Failure to replace the O-ring between the shaft and the collar
  • Installing the seal out of square with the shaft
  • Installing the seal too deep (should be not quite flush with the case
  • Failure to properly tighten the nut

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