YZ timing mod on WR426

6 replies to this topic
  • Smur3

Posted February 23, 2004 - 01:09 PM


I've seen a few posts saying to mod the WR426 w/YZ timing but can someone who's done this describe it? Meaning, what is the benefit, what is involved in changing it, and is that a main diff betw a WRF and a YZF? Do a lot of you prefer stock WR timing?

  • FTD

Posted February 23, 2004 - 01:34 PM


I had the fortunate opportunity to ride my bike (WR timed at the time) on a single track trail, then hop off it and ride the exact same bike with YZ timing. I got off and he asked, "Did you like it." I said, "NO! (because I told him I had no desire to change) but when can you do mine." I really noticed that it revved out quicker. Some complaints were that the WR stalled in the tight stuff with the YZ timing... can you say "clutch control?" I didn't see much of a change in that area.
YZ time it!!!!!!!!

  • jwriott

Posted February 23, 2004 - 01:56 PM


Go here. Motoman393 Site

I changed and the bike is a lot more fun to ride. Revs quicker, runs smoother and I don't think I lost any bottom end.

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  • jchantzWR400F

Posted February 24, 2004 - 03:55 AM


I agree with everyone else. I just YZ timed mine 2 months ago. Very noticeable difference. Souded better, ran better, quicker throttle response. Just more eager to get going. I have not noticed any issues with stalling.

See the motoman website. IMO you do not need to remove the cam chain tensioner.

Have fun with it.

  • jwriott

Posted February 24, 2004 - 05:20 AM


I think you could also do this without removing the exhaust cam. Just mark the chain and cam with white out, loosen the tensioner, lift the chain and rotate the cam 1 tooth. :)

  • jchantzWR400F

Posted February 24, 2004 - 08:13 AM


On mine, there would have been no way to rotate the exhaust cam without removing it. There just wasn't enough clearance.

If you could do that, it sure would be nice.

  • Hamish

Posted February 24, 2004 - 10:19 AM


you won't have enough chain length to move the timing one tooth without removing the camshaft. As I found with my engine, the TDC mark isn't always perfect. It's a good idea to check that too :)



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