This depends on whether it is an electronic speedo or a mechanical speedo.
The electric speedo has a sensor near the rear of the engine. Sometimes a very small piece of metal will get stuck on the end of the sensor and the speedo will stop working. Remove the bolt holding the sensor into the engine case and carefully pull the sensor out. Wipe it off and reinstall it. If the speedo still does not work, it's probably something in the speedo itself.
On a mechanical speedo, a cable from the front wheel drives the speedo. The cable or the speedo drive unit may be bad. To check the cable and drive, lift the bike off the ground, disconnect the cable from the rear of the speedo. Turn the front wheel and see if the cable is turning. If it is, it's probably alright. I'd still pull the cable out of it's housing and lubricate it with some grease. If the cable is turning, the cable and drive unit is alright. The speedo may be broken.
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