Differences between YZ and WR head?

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.

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

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.

does the WR and YZ have identical porting?

does the WR and YZ have identical porting?

Yes, they are identical.

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

This should answer your question... http://www.thumpertalk.com/forum/showthread.php?t=1031974&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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