I have a wr426 grey wire mod done not sure of the yz timing mod but will check! i have replaced and tested every electrical part on my bike(except cdei) and still no spark. Last thing to do here is change out cdi however I'm now on a limited budget! i found a yz cdi for 140 dollars cheaper then i can find the wr cdi I have a 2001 wr 426 does anyone know or has it been done yet can i swap the cdi's? another words willt he yz cdi work on my WR ?