RSI Racing Throttle Block Kit with Kill Switch TB-3 Smaller than stock; replace bulky stock throttle blocks Give the handlebar a cleaner, more streamlined look and allows for more room for handguard, mountain bars, GPS, etc. mounting Stock engine stop switch is relocated to the front of the handlebar which helps to prevent accidental deployment (Polaris models only) Use OEM throttle lever pivot pin safety switch, push button stop switch and existing thumb lever