kindly share the distance covered by your YB 125Z when the fuel is off.
1. 1st warm up the engine.
2. put your bike on double stand turn off engine and let the fuel fill in carburetor chamber.
3. now turn off the fuel to make sure no petrol go to the carburetor pull the fuel pipe off if u like.
4. set the trip meter to zero before riding.
5. now start and ride ur bike on a light trafic road and note the reading of trip meter when ur bike engine stop.