Part configuration

[woodworker_dog]

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]

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]

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.

[woodworker_dog]

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

[VOODOOCHILD]

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]

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]

http://www.yamaha-motor.com/sport/parts/home.aspx

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