Flying Horse 2-Stroke Motorized Bicycle Combo Brake and Clutch Lever &ndash; Gas Bike Brake and Clutch Upgrade Tired of too many levers on your handle bars? With the Combo Brake and Clutch Lever you'll have the ability to engage, disengage, and idle your 48cc or 66/80cc bike motor AND engage a brake with only one lever To install, simply install the brake cable in to your caliper and the clutch cable in to your clutch arm. Mount the handle and you're ready to ride To disengage the clutch, you would push the thumb actuator and switch it to the 2nd gear position. Then to engage the engine, you push the finger trigger to shift from 2nd gear to 1st gear which engages the clutch