I had some extra tire valve stem caps that I had picked up at an inexpensive hardware/tool store for next to nothing. The knurled aluminum valve stem caps are long, making it easier to grip, and come in different colors like red, blue, and natural aluminum silver color.
Directions to install valve stem cap on fuel mixture screw:
- Grind off the tab from the fuel mixture screw, as show in the "XR650L Carb Mods" article.
- Mix up some two-part epoxy and run a small bead around the end of the fuel mixture screw and push the valve stem cap on. Twist the cap while slowly pushing the fuel mixture screw into it will help distribute the epoxy evenly inside, and create a nice bead at the edge when you are done. You will have plenty of time to make sure that the fuel mixture screw is situated perfectly straight in the cap before the epoxy mixture cures.
Credits: Article submitted by Brian Farewell and edited by 4Strokes.com.