I was thinking about changing the cam in my 98' YZ400F so that I could get rid of the decompression lever setup. Which cam do I need to purchase? Is the procedure much more than changing cam, plugging decompression hole, and setting the valves? Any different timing issues? Now the head on this motor is off of a 2000 WR. Does that change anything? I'm going to assume not because it works good on a 98' motor. Any help would be wonderful. Thanks.