@docsaq
Its Zeschan ( from Dewan)
Actually when anyone buys a new vehicle, its recommended to the buyer to run their vehicle to atleast 1000km over Petrol and you are started using ur Santro after 200km.
If this is not the reason, then their should be some minor adjustments needed in ur CNG Kit.
Visit our delaership "Hyundai Twincity Motors".
Its located in I-10/3, Khyaban-e-Jauhar (ISB).
I am sure your problem would be solved.
Dont panic and confused and believe me you have purchased the best Car in 1000cc range along with Efi Technology.
And remember one thing that Santro's AC is the most powerful and reliable AC in all kinds of weather.
Wish you good luck with ur Santro.