Differences between YZ and WR head?


5 replies to this topic
  • Save_A_Tree_Eat_A_Beaver

Posted December 30, 2011 - 12:17 AM

#1

My 07' needs a new head assembly and they are on backorder till March from what I am told. Will a head from a 06'-09 YZ450 work? What are the differences? Thanks.

  • YamaJet

Posted December 30, 2011 - 06:15 AM

#2

Sorry I can't answer the compatability question. I am curious why you need a new head.

  • 2grimjim

Posted December 30, 2011 - 07:17 AM

#3

I am curious why you need a new head.


The '06-'07 YZ head will work with no problems. '08+ had a bigger head pipe flange. The only difference between the WR and YZ head is the AIS crap is deleted on the YZ.

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  • MaxPower

Posted December 30, 2011 - 10:47 AM

#4

does the WR and YZ have identical porting?

  • 2grimjim

Posted December 30, 2011 - 11:33 AM

#5

does the WR and YZ have identical porting?


Yes, they are identical.

  • Save_A_Tree_Eat_A_Beaver

Posted December 30, 2011 - 11:47 AM

#6

Sorry I can't answer the compatability question. I am curious why you need a new head.


This should answer your question... http://www.thumperta...1974&highlight=

The '06-'07 YZ head will work with no problems. '08+ had a bigger head pipe flange. The only difference between the WR and YZ head is the AIS crap is deleted on the YZ.


Great thanks man. Just the info I needed. Blocking off the AIS is one of the first mods anyway...




 
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