Hello there, I have a brand new honda city with just 1400 km driven. I had just one question, can I just take it on road and speed up for example go to 4-5 rpm and 100-120 kph. Can I do this with a new car. Would it cause any damage to engine or car?
A new car break-in is done to establish new internal mating surfaces of mechanical parts, to seat new piston rings, to establish new seal surfaces, to condition new mechanical parts--to make sure all the moving parts were working together as smoothly as possible. After the break-in period, which lasted for about 1000km or more on average, the vehicle could be driven without concern.
Now you have clocked around 1400 km you should not be worried about damaging your engine any more and can take it for a long run.