Part configuration

6 replies to this topic
  • woodworker_dog

Posted February 04, 2007 - 06:29 PM


A few questions for the experts...
1) Will a 2000 WR400 head fit on a '99 YZ400 cylinder?
2) Will a 2000 WR400 cylinder fit on a '99 YZ400 lower end?

Thanks in advance for the help...

  • kylwk1500

Posted February 05, 2007 - 08:03 AM


yes everything should match up pretty well. If you want to make sure just see if the numbers crossover through a yamama parts catalog

  • grayracer513

Posted February 05, 2007 - 09:01 AM


Part numbers don't always tell the whole story. The WR head may have (or be missing) one extra threaded hole and thus get a different part number. Often, if you compare the PN's of the associated stuff such as gaskets, head bolts, etc., you can get an idea from that.

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  • woodworker_dog

Posted February 05, 2007 - 03:03 PM


Thanks for the input... Anyone else out there with some info I'm still interested in hearing what my options are.


Posted February 09, 2007 - 06:58 AM


I have a 98' 400F and I used a 2000 WR head when I rebuilt it. The only modification that I had to do was drill the hole for the hot start valve. You can purchase the brass tube for the hose and just press it in. I put the YZ cams and caps back in. It's been running great. Still have the WR Cams if anyone would want to buy them. Good luck.

  • grayracer513

Posted February 09, 2007 - 09:13 AM


I put the YZ cams and caps back in.

By "caps" I hope you mean lifters, and not the cam caps that form the upper half of each cam bore. These must never be mixed between heads.

  • mn519

Posted February 09, 2007 - 01:16 PM


yamaha parts manuals online. check out your parts there. I have learned alot form checking out part numbers of different bikes on there. seems allot of parts interchange even from model to model, over the last 10 years

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