My 93 GSXR 750 has just had the rev counter go off the scale at modertae revs and stay there. At tick over it registers between 5 and 6 thou. Makes no difference with the lights on or off.
Could anyone out there confirm whether this is the rectifier / regulator - or could it be something else. No other issues at all with the bike, engine runs fine etc.
Cheers

 

Maybe its time for a new tach cable.. The end which feeds into the motor may be stripped, therfore making it very sensitive.. Only thing i can think of..