RFX Race Series Kill Button (OEM Replica) Kawasaki KXF250 04-14 KXF450 06-14 KLX450 08-14. RFX Race Series kill buttons are an exact OEM replacement part. Complete with the same couplings, fasteners, connectors and exact cable lengths as the genuine part. Available for a wide variety of bikes. OEM replacement. Accepts all original connectors. OEM cable length.