You want to use a 7/64" drill bit to open the hole in the top of the slide, then use the next size up bit to chamfer the hole a bit, just enough to clean up the edge. Also I have installed a shim on each needle, a #45 slow jet and anywhere from a 130 and up for the main, depending on your riding style. This will get you a smooth quick responding throttle that you can crack like MAD without break up!
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Gary James
