Winter project - lights for my 2010 YZ! There were a few skeptical mechanics that told me this couldn't be done - HA! Thanks to loads of good info posted on the TT forums, some trial & error, and my trusty mechanic Steve Sage, it was a success!
Polisport HMX (LED) headlight ~ $100 (clears the ECU with mounting kit supplied)
Polisport (LED) tail light ~$30 (very small and lightweight)
K&S universal headlight on/off switch ~$25
K&S pressure switch (for rear brake light) ~$30
Galfer front brake line to clear the headlight (I bought one that fits the 2013 WR model because the YZ stock brake line is too short) ~$90
This works and looks AWESOME - No battery required! The LED lights are bright, don't dim at low rpm, and they use very little power. The stock stator has plenty of extra juice to run the lights, but needs a lot of juice to start the bike and fire the EFI. You can probably start without switching the lights off, but the on/off switch seemed like a good idea and was inexpensive.
I didn't use this harness but it's worth checking out...
Baja designs has a plug-in switch for the EFI YZ harness & instructions for connecting the switch and wiring harness on a YZ450 EFI bike. http://www.bajadesig...NSTRUCTIONS.pdf
One Small modification: hole drilled through the headlight mount left side for the brake line to feed through - lines up perfectly with the guide on the left fork.
Edited by MikeMack, April 04, 2013 - 09:16 PM.