I have heard of many cases where the stock stator of the Honda 450X has failed, I believe the Honda Europe bikes had the Trailetech DC upgrades. Not 100% sure, but I believe a newly made wiring loom is the best solution ot cope with the upgrade. I did that on my WR450F, prior to the stator upgrade, also a Trailtech, there were somethings I wasn't happy about. E.g. the small stock ignition switch would also pass the current that was required for the headlight, so several amps went through the mini on/off switch. Just my 2cents.
Tell him he can get in touch with me, I can sort something out together with him and Henk from Honda!