cam timing question

5 replies to this topic
  • rigamortis rex

Posted August 12, 2005 - 10:39 AM


I am putting together a 98 wr 400, and I am having troubles determining which mark on the cam sprockets are the ones that you need to line up with the top of the head. any help would be apprciated.


  • rigamortis rex

Posted August 12, 2005 - 10:54 AM


there is some type of hyrogliff on the back side of cam sprocket that you will need to decifer, I believe it is a dog, a sun, the moon, a blender, and some playing cards.

god speed young lad!

  • MattyH

Posted August 15, 2005 - 03:34 AM


the service manual should provide the key to unlock the mysteries of the dog, sun, moon and blender. or just walk into your local yamaha dealers showroom and do a cam installation dance which is rather like a rain dance but can ultimately be life threatening if you and your spectators arent wearing helmets at the time.

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  • jchantzWR400F

Posted August 15, 2005 - 07:10 AM


I'll take a shot here. At TDC the cam lobes (exhaust and intake) should face away from one another. When looking at the timing marks on the sprockets, the 3:00 and 9:00 marks (on each sprocket) should be parrallel (or close-mine never were exact) with the head.

  • HamBonE_23

Posted August 17, 2005 - 05:07 PM


This is a pic from my garage. This is what mine looked like before i advanced it to the YZ timing.
Mine is an 01 WR 426 though...

  • TeamScream

Posted August 27, 2005 - 09:51 PM


Also on Motoman393's page I think there is a good write up about it.


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