wr450 head fitment 06 on a 04??


3 replies to this topic
  • mattrichter

Posted July 12, 2011 - 04:42 AM

#1

searched the www and tt but came up with nothing

have a 04 wr450, will 06 wr450 head fit it?? any of you wr guru's know??
thanks in advance

  • CanadianWR450

Posted July 12, 2011 - 11:01 AM

#2

I'm almost positive it will fit, but it is not the exact same head....

An exert from this webpage where they compare the 04 to the 05 bike - http://www.dirtrider...r250/index.html


"The 450's bark was partially calmed by reducing the compression ratio. It still has big power, but now comes in a more manageable package."

I believe they made some head changes (porting, cam's, or other things along those lines..) to mellow out the "hit" some.

Pretty sure you could use it with no issues, but, as I have never tried, or know of anyone else who has, I'm not prepared to bet my life on it...

Someone else more knowledgable on here may know for sure.

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  • JSanfilippo

Posted July 16, 2011 - 11:15 AM

#3

IIRC yamaha changed the shape of the combustion chamber, going from 12.5:1 to 12.3:1. Also the '06 head will need all the AIS ports blocked off.

If you can, just get an '04 head.

  • gjscott

Posted July 20, 2011 - 01:24 PM

#4

searched the www and tt but came up with nothing

have a 04 wr450, will 06 wr450 head fit it?? any of you wr guru's know??
thanks in advance


Check the crank, connecting rod and piston are the same part number for both bikes, if yes I'd say you're good with the 06 head.




 
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