big bore kit for the yz450f


2 replies to this topic
  • Rossco22

Posted June 24, 2004 - 08:25 AM

#1

can anyone recomend a big bore package for the yz450? :thumbsup:

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  • Mossman

Posted June 24, 2004 - 09:11 AM

#2

Call Thumper Racing, they have 99mm kit (500cc) that rips.

Good luck!
Joe

  • cheeta

Posted February 17, 2009 - 07:46 PM

#3

i have an Athena 478 kit on my yamaha 450 with head work. awesome combination





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