questions about buying parts for a yz400f or 426 head

2 replies to this topic
  • peaceofwork

Posted November 09, 2012 - 10:14 AM


are these heads the same core and do all parts interchange?
i have been studying up flee-bay watching guides valves springs and retainers and keepers but the years the suplyrs say their products will fit is bafling me
i know stanles steel valves take heavyer springs and that posibly the 2000 426 came stock with steel valves but what do i really need to know before i order to redo a head?
i,ve seen stock yamie valves are going kinda cheep but will they all work well in eather a 400 or 426 head ?are their any differences i should know about?

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  • jojo1224

Posted November 09, 2012 - 10:39 AM


Going by the part numbers and diagrams on the 1999 yz400f and 2000 yz426f. The valves/spring/retainers/buckets are all the same, the only real difference is the head core.

400 - https://www.thumpert...1999&model=6989
426 - https://www.thumpert...2000&model=6943

  • peaceofwork

Posted November 10, 2012 - 10:59 PM


any real difference performance wise between them?

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