On a motorcycle with cable-operated controls, inspect the housings, exposed strands and routing around the handlebars. Sharp bends, pinching and rubbing against other parts deserve closer attention. With the engine off, check that the throttle moves freely and returns by itself when released at different handlebar positions.
The cable’s barrel end in the lever matters too. If it cannot rotate freely, the wire flexes in one place and can wear prematurely. When servicing the controls, clean and lubricate the specified moving joints as the workshop manual directs. Take free-play settings from the instructions for your model, not another motorcycle.
Before lubricating inside a cable, identify its construction and the manufacturer’s requirements: the product must suit the inner liner. Ordinary oil is not a universal choice. Lubricant cannot repair broken strands. If a cable is damaged or the throttle fails to return, fix the fault before riding; let a workshop investigate an unclear cause.