Just making a point for those who may not know and have a rear rack fitted. 
15 minutes will have the tail light out, your ECU to TPS test done and all back together. How can I be so sure, I did it yesterday
The simplest thing to do is remove the TPS.
Check the carburettor to ensure the projection end in not broken or damaged.
Turn the TPS using a flat screwdriver to see if the Rev counter changes and if it does replace the TPS if it remains at 5000 replace the TPS.
The TPS can go high resistance, but that would show 10K.
15 minutes will have the tail light out, your ECU to TPS test done and all back together. How can I be so sure, I did it yesterday
The simplest thing to do is remove the TPS.
Check the carburettor to ensure the projection end in not broken or damaged.
Turn the TPS using a flat screwdriver to see if the Rev counter changes and if it does replace the TPS if it remains at 5000 replace the TPS.
The TPS can go high resistance, but that would show 10K.