Yz450f header pipe on 2010 wr450f


7 replies to this topic
  • Cooneyjj

Posted July 07, 2014 - 12:53 AM

#1

My 2010 wr450f has a gytr muffler with the stock header pipe which requires a slip on insert to fit the two together, I want to eliminate the slip on insert. I've heard the yz's hear pipes are bigger therefore it's a flush fit between muffler and header. Can any one confirm this for me ? Cheers !

  • Krannie McKranface

Posted July 07, 2014 - 04:51 AM

#2

You are correct



  • stevethe

Posted July 07, 2014 - 05:58 AM

#3

The 08 and 09 Yz450 have the largest head pipe. They fit in a FMF rear tail section without a spacer not sure about the GYTR unless it's the same as a FMF.



  • Cooneyjj

Posted July 16, 2014 - 03:27 AM

#4

Ok sweet thanks

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  • SilvFx

Posted July 16, 2014 - 08:28 AM

#5

Cooney...dont make the assumption that the YZ450F headpipe will make it run better.  I owned an '08 YZ450F and the low end is lacking a bit (compared to the WR) partially due to the size of the head pipe.  So, while it may look cleaner to no have the FMF insert/spacer it may make take away some low end grunt on your WR.

 

So....i wouldnt spend alot for a YZ head pipe for your experiment.



  • Cooneyjj

Posted July 16, 2014 - 05:15 PM

#6

Cheers slivfx ! I wasn't to concerned power wise as I've had the wr rejetted but yer I'll still take that in to consideration ! I am trying to find a Second hand header pipe but there none around cheap enough !

  • stevethe

Posted July 16, 2014 - 06:00 PM

#7

Um not sure about losing low end with that header pipe. I run them on all of the WR's. But they are pricey.



  • Cooneyjj

Posted July 16, 2014 - 06:54 PM

#8

Yer my wr cracks pretty hard since the rejetting ! But yes that's the main reason I haven't gone and got one because there bloody expensive ! My old mans 2012 wr450f header fits perfect with the gytr slip on muffler but there $340aud !




 
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