Locate the cable adjuster, which is located on the underside of the throttle handle. The throttle handle has a lever that allows you to control the engine speed. The adjuster is a small nut at the point where the throttle cable meets the throttle handle. Turn the cable adjuster counterclockwise to loosen the throttle cable at the handle of the unit.
Slide the throttle cable out of the handle.
Follow the throttle cable down to the engine.
Locate the nut that holds the throttle cable in place on the throttle itself.
Loosen the nut on the throttle with a wrench. Remove the throttle cable from the unit.
Cut the replacement throttle cable to the same size as the old one.
Reassemble the throttle cable system in the opposite order of the way you disassembled it. Tighten the throttle cable tensioner until the cable is taut. Turn on the unit and test the cable.