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woodworker_dog

Part configuration

7 posts in this topic

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...

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

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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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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.

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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.

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