Flying Horse 2-Stroke Motorized Bicycle Engine NT-Carburetor &ndash; Gas Bike Carb Replacement The NT Carburetor is a great starter carburetor that works with any 2-stroke 48cc or 66/80cc bike engine kit Installation is a breeze: begin by opening the throttle cable port of the carburetor and sending the bare cable through it. Take the jet needle and plunger from inside the carburetor and install the throttle cable in to the plunger, being sure to install the spring on the throttle cable as well. Thread the throttle cable port back on to the carburetor and slip the carburetor over the intake manifold on the cylinder body. Clamp the carburetor down on to the manifold and you're ready to ride Note: Be sure to choke your engine on cold days and tune when needed