Here is a tech article that I did for when I wired my old 2001 XC250. This bike had a 2K-2 ignition with minimal wiring.
http://www.gasgasrider.org/html/headlight___horn.html
Like Jostby mentioned, you first need to find out if the 2K-2 ignition has a lighting coil attached to it. Pull off the left side cover and take a peek inside. Or look in the wiring loom for a yellow wire (hot). Between the tech article, wiring diagrams, and the guys here, you will get the bike street-worthy. 
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Matt
Current: 2009 Yamaha FZ1
Previous: 2001 GasGas TXT280, 2001 GasGas XC250, 2004 KTM 200EXC, 2007 GasGas EC250, 2007 Husqvarna SM610, 2008 Husqvarna WB165
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