With the winter months coming upon us quick and the short days and early nightfall, I wanted to be able to extended the usable riding hours by upgrading the headlight on my '07 KTM 450 EXC. The stock headlight, I think, sucks for off-road, throwing little light, certainly not enough to have any confidence night riding. But I still wanted to remain passably street legal, that meant those nice Baja Designs 8" race lights were off the table. So I searched around and investigated a HID conversion. I looked at the Trail Tech X2, but it appears to be off-road only, no high/low beam, and still says "coming soon" like it has for months now. So instead I went with H4/9003 Bi-Xenon Hi/Lo HID Conversion Kit (Single-Bulb) from XenonRider.com . http://www.xenonrider.com/products/h4_bi-xenon_hid_kits.shtml This ran $165 with the upgraded slim ballast which I wanted to be able to stuff it all behind the headlight mask. The conversion starts with converting the electrical system to DC-only. I used the Baja Designs DC conversion kit to do that at $55, part number 611040: This mod requires removing the stator cover and the stator: Before the mod: And desoldering two tap points and splicing them together with the provided teflon wire and crimps and soldering them for a good connection. After the mod: After re-installing the stator and cover, you need to make a simple modification to the stock wiring harness to separate the headlight and taillight feeds from the old stator output connection, and tap it into the 12V DC pick-up which picks up off the relay under the headlight mask. You then replace the stock regulator with the new one provided in the Baja Designs kit. The instructions are easy to follow and all the connectors and extensions are provided in the kit. It's a simple conversion. You will know you did it right when you turn on the key and the headlight lights up. I have the Sicass slim headlight switch which has an off-position so if you have one of those, make sure it is "on" when you do that. Now that the stator is upgraded, and headlight is DC powered, you have done all the prep work for the HID conversion. The XenonRider Bi-Xenon hid conversion kit comes with an H4 bulb, ballast, relay and connector to plug into the stock harness, and all the wiring connectors. The one thing you will need to provide is a power cable from the battery up to the headlight mask. I used the fused end included in the XenonRider kit and just extended that up to the headlight mask with some additional wiring and terminated with a female trailer wiring connector that I cut down to two connections. For the kit itself, I replaced the bulb and reused the stock dust cap. Just use scissors or a sharp knife to cut out a circle in the center to accommodate the bulb. Note that the bulb section separates in the middle so that you can slide the rubber dust cap over, then the stock bulb locking ring, then the bulb hood. Insert into the stock headlight reflector, and lock it in place with the stock lock ring. Then slide the dust cap into position onto the reflector housing. I also retained the stock parking bulb, not because it is really needed for light, but because it blocks the hole that would otherwise allow dust and moisture to enter. The stock bulb plug does not plug into the H4 xenon bulb, but instead, the kit provided relay plugs into the stock bulb connector. So your bar switches simply activate the relay, which in turn supplies power to the xenon bulb and activates the "low beam" solenoid. Now the hard part, you have to mount the ballast and all that wiring in behind the faceplate somehow. I started by mounting the ballast with 3 screws through the ballast mounting holes. I then arranged the wiring, connectors, and relay as best I could to sit in the mid-portion of the headlight mask, above the head light, but low enough to clear the indicator bulbs in the stock dash. I used tape to hold the bundle together, and plenty of zip ties, and even a short length of aluminum flat stock to provide some stability. Here is my self-contained HID converted headlight mask after I was done: When mounted, you can tell no difference from stock except the 3 ballast screws: I've taken it on two rides so far over some rough terrain and it has so far held up well, no surprises, and no problems. At night it really throws out a ton more light than the stock headlight. And it also retains a passable low beam for the street, though I did have one car flash me even when I was on low-beam so it may still be a bit bright for the road. Here it is powered, this is taken with camera flash on: And this one is with the flash off: Sorry I don't have any "before" photos for comparison, but the "after" results make a huge difference. Off-road especially, the trail in front and to the sides is illuminated very well and is much safer and enjoyable for riding at night. The only thing better would be some helmet mounted HID in addition so that you can still see while you wheelie, jump, and top-over hills.