a fun project, you will need an airhorn (about $10 at walmart etc) A BMX bike brake lever and cable. an elbow catch ($1 at the hardware store) mount the brake lever near the clutch lever so you can reach it. ziptie the horn under the nosepiece. drill a hole big enough for the wire part of the cable to slide thru the bell of the horn as shown, you may need to add a return spring if the cable is stickey. the fun part is telling your buddy to look at how you stricked something out on the a-arm etc, he bends down to look at it and hit the horn,,he will go airborn hehehe on the track, it will get people out of yourway, and has a cool factor if you hit i while airborn over a big jump I:I
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