Mikuni Rs Series Carbs 38Mm RS38-D19-K Available in 34, 36, 38 and 40mm bore sizes Application chart is for reference only, actual bore size needed will need to be determined by the installer Tuning specs. noted are subject to change without notice and are guidelines only Throttle assembly with push/pull cables available separately, fits all RS series carburetors &nbsp; &nbsp;&nbsp;&nbsp;&nbsp;