Demon changed their linkage temporarily on the Demon series (not King Demon) carbs to a different style and then changed it back to the original configuration. Unfortunately there are no production dates stamped into or attached to the carbs. The only determining factor is that if the linkage arm supplied with our JEGS throttle bracket does not line up with the throttle lever on the carb itself. In such a case the 15230-3 will replace the linkage arm on the JEGS throttle bracket to fit the interim lever on the carb.