What year is my motor?

I have a hybrid 400ex with a YZ426 motor transplanted into it and am considering putting a Wolf CDI on it, but I do not know what year the motor/electrical is. The pipe is cusom, and I'm wondering if there is a marking on the motor or CDI to determine year. Any help would be appreciated as I've got about a month before my broken arm heals to once again get it race ready. Thanks.

426 motor would be either 2000,2001,2002. If it has steel valves, it's a 2000. 01 and 02 have titanium vales. Also, IF it has the stock yamaha head pipe, 00 and 01 pipes cover the oil filter cover to the point that you have to move them to get the filter cover bolts out. Hope that helps some.

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