Help 2001 Yz 426

3 replies to this topic
  • fatboyrv

Posted December 11, 2005 - 06:47 PM


i ride a 2001 yz 426 stock pipe ride desert and purchased a pro circuit t-4 got it already havent installed it yet but im about 200 feet above sea level and was wondering what size jet or jets should i run

  • Slowbiz

Posted December 12, 2005 - 07:49 AM


Try stock first. It might run great.

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  • Shawn_Mc

Posted December 12, 2005 - 08:30 AM


If you need anything at all it will only be one size larger on the main. Like the man said, try it first. If it goes flat on the top, just bump the main one size.

  • sldietz

Posted December 12, 2005 - 09:40 AM


I run a full FMF Ti system on my 01 426 and made no jetting changes...runs perfect...Im in the central valley.

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