Hi , got a problem with my Rectif/regul on my dragstar 400 ,i bought a new one but now i have no sparks at the plugs, I think my CDI took a hit also, Can I use a CDI from a 650??It looks they are the only ones avaliable on the market,serial numbers of CDI vary 4JT079,4JT088 mine is 4JT073 is it important ?? PLS send me e-mail, thanks.