Join Date: Jun 2004
Location: Mesa, AZ - hot, just like hells hinges.
2003 R1 idle adjuster is on the left side of the bike. There is a grey metal spring clip that holds it on, it is almost tucked right up under the frame close to where your left inner thigh would be while riding. If you see the spring clip, then it popped out and is dangling in there someplace. It should have a black knob and a white plastic spacer that goes into the spring clip.
If you can't find it, pop the seat, lift the gas tank and look at the center of your carbs. It is probably just tucked into a crevice or wire loom.