cams wr450 to a yz 426

i can get a 03wr 450 exhaust cam for my 02 426. i know it will fit, but a wanted to know how the performance will be if any? or will it work right.

You would have to time it as you would any other cam made for the 450 (time the stock intake then count pins to the exhaust cam). The WR cam is more advanced than the YZ grind, and that will cause a drop off in mid and high end power, while increasing the smoothness of the engine at low speeds.

I haven't heard of anyone doing this, so I'm not sure how well the auto decompression feature works with that particular mix.

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