Nar JR and KO are totally different.
Im using JR's 8455 for throttle and 8715 for steering. The 8715 is a new release and has 12kg of torque and .09/60deg @ 4.8v. Lightning fast and huge torque. The part numbers I have might be different to whats available in the states, cos I'm an Aussie.
Losi, JR Propo ,Spektrum, Novarossi, AT Racing Fuels