The early bike fuel cut relays have a different style connector than the f2's, apparently the early CDI gives out a slightly different signal which is basically just an extra tach signal for the relay to see. Pretty sure the later cdi's send out a different signal for the fuel cut relay, not just a tach signal. There is no extra controlling or anything done by the early relays thanks to it seeing the rpm's or anything, still just on if it sees any revs at all and is a more annoying connector set