Athena big bore kit in 2006/2007 YZ450?

1 reply to this topic
  • Ben_Atkinson

Posted July 05, 2007 - 10:45 AM


Has anyone put an Athena big bore kit (478cc) in their 2006/2007 YZ450? If so, how does it work? Do you have to change the jetting with this kit?

Are there any other options for a bigger motor besides the Athena kit?



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  • FLjoyride

Posted July 05, 2007 - 11:10 AM


Here is this vertex one:

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