How to change WR400 cam timing?

What is the procedure to change The cam timing on a WR400 to the YZF400 cam timing? are there any websites that have pictures and stuff?

thanks for the help! the guys at my local shop think that changing the cam timing to YZF timing couldn't be done. lol. The bike came with YZF timing when I bought it, but then I took apart the whole top end...

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