If your speedo isn't working (could be several reasons- most common being broken sensor in the wheel or broken wire)
Once you go over 10k revs the counter will drop to zero, up to 4k, then to what the revs actually are then repeat until you turn off the ignition, there's only two ways to prevent this- either don't rev over 10k whilst riding or fix the speed sensor problem.
If the tacho is reading a different figure to 4k then it is a fault code referring to a different problem from a speed sensor one!
Check the length of the wire from wheel, easy to snag it against the brake disc and cut through the protective outer layer!
Once you go over 10k revs the counter will drop to zero, up to 4k, then to what the revs actually are then repeat until you turn off the ignition, there's only two ways to prevent this- either don't rev over 10k whilst riding or fix the speed sensor problem.
If the tacho is reading a different figure to 4k then it is a fault code referring to a different problem from a speed sensor one!
Check the length of the wire from wheel, easy to snag it against the brake disc and cut through the protective outer layer!
Some say...