km/hr indication wrong

[Constandinos 2]

Dear all,

I have just bought a used NC750X DCT 2014 in Cyprus.

The speed indication was in mph and everything is OK. When I changed to km/hr and as soon as the motorbike speeds above approx 30 km\hr the indication on the screen fluctuates to any value from 0 to 200 km\hr. When I revert back to mph everything is ok. I am a newbie so any help is appreciated.

Thanks 

Constandinos