Bouncing speedometer

[harbor]

Hi, Everyone

k6 bouncing speedo start@ over70mph been check and clean sprocket cover replace used speed sensor, but still bouncing when is cold bit better
need help^^

 

[TNTom]

I'll take a shot, however I haven't had that specific problem. Check your wires up from where it joins the harness at the frame. Since it starts at over 70, it could be the faster pulse rate is intermittent thru a severely pinched or frayed wire, or more likely it's picking up other signals such as spark plug wires, or rpm signals.