WR 426 cam caps/holders help needed?

2 replies to this topic
  • fixitandy

Posted July 16, 2015 - 03:33 PM


Hey, I'm trying to help a mate out resurrecting his 426, he tried to shim it himself & somehow lost the cam caps/holders, I've heard that some WR/YZ 250 caps/ holders will fit, can anyone verify this please? Cheers Andy.

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  • grayracer513

Posted July 21, 2015 - 09:29 AM


Even if you had another pair from another WR426, they would not work without having them line bored to match the the half of the bore that lies in the head.  The process involves milling a small amount (about .001") off of the mating surface on both caps and on the head, then torquing them in place and reboring the cam bores.  Just bolting them down is a 99% guaranteed screwup.

  • fixitandy

Posted July 25, 2015 - 12:17 AM


Thanks mate, as always a great source of reason, will heed your advice. Cheers Andy.


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