Good day,I have a 2008 CBR1000RR and my rev counter isn't working but the digital speedo is working, last year I lost my keys and borrowed an ECU and Ignition from a bike mechanic, it was back working after the engine started. On discovery of my key I then put back my ECU and Ignition back and my bike is still back to the same problem. If I put ignition on the goes to limit and back.
