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Last weekend, I had the opportunity to attempt to re-wind the lighting coil on my KDX200. I had done a little bit of reading on the subject, and I was a bit nervous about it. I bought a spool of 18 gauge magnet wire and had at it. The reason that I wanted to do this was that I am running all of the street legal hardware required for an inspection - directionals front and back, high and low beam headlight (35/35w for now), brake and tail lights (w/front and rear switches), and a horn and a high beam indicator - all with no battery. The stock coil is only good for 50 watts or so, and I had to run a very low wattage tail/brake LED bulb to get everything to work. Even then, things barely lit up and would flash or dim with the directionals.
The re-wind was fairly easy to do, and it took me about an hour. At first, I over wound it, and the coils hit the inner flywheel hub, so I had to remove a full layer. It seems to have worked, though. I was able to go back to a standard 1157 tail/brake bulb - and it is very bright. Everything else works great now as well. I still want to try a 55/60 watt headlight, but I have not done that yet...