KICK UP - Refers to the upward angled section on the front of the chassis on off road models. The kick up allows the model to slide over obstacles and keep the chassis from 'digging in' while bottomed out. The angle of the kick up is often referred to as caster, but kick up has nothing to do with the relative angle of the suspension arms.
KILL SWITCH - A button on a gas powered (fuelie) engine that cuts the voltage to the spark plug when pressed, effectively 'killing' the engine.
KILOVOLT - KV - kV - A brushless motor's kV rating = 1000 RPM per volt without load. Thus, a 4.8 (4,800) kV motor will spin at 4,800 RPM per volt. With a 7.2V battery pack, that motor would max out at 34,560 RPM (4,800 X 7.2 = 34,560). The final RPM rating varies according to the model's weight, drivetrain efficiency, drag, ect. The kV rating is usually used with sensorless motors, while the turn rating is usually used with sensored motors. Also See - MOTOR CONVERSION
KINGPIN - An upright, stationary pin that holds the steering hubs (a.k.a. steering knuckles or pivot blocks). King pins are common on pan cars and rides using C hub suspensions.
KIT - An RC model that comes unassembled and must be built. A kit may or may not include: the motor / engine, radio equipment, body, tires, or fluids and oils. Many 'hardcore' enthusiasts prefer kits, as it lets them build the model to their specs.
KNIFE EDGED CON ROD (CONNECTING ROD) - Refers to a con rod that has had it's edges beveled, resembling a double edged knife. This helps reduce resistance as the rod moves through the air / fuel mixture inside the crankcase, resulting in more power due to reduced drag (as well as less weight).
KNUCKLE - Refers to a hub carrier that can be used for steering or has adjustable toe. Models with pillow ball suspensions use knuckles on all four corners.
KOFORD - See TRACTION COMPOUND
KV - kV - Abbreviation - See KILOVOLT