Hi Folks

My Qingqi Supermotard 200cc has a tachometer that indicates more revs than real.
It´s weird couse doesn't happen all the times. Sometimes its ok.

I Know this couse in 5th gear at 6500 rpm the speedometer show 100km/h but the other day was at 5th and 100km/h and the tachometer shows 10 000 rpm. I stop an at idle shows 3500 rpm

What can be wrong?

Anything else seems to work OK. I made a 1200km trip this week (semana santa) with no problem besides the tach.

Im sure this is not good. But can't figure it out.

Thanks in advance
andres357mag