Problem resolved today when i visited Mini Motor workshop, Gulberg, today. I asked them for tuning and during the process the mechanic found an electric wire damaged under the carburator and called the electriction, who repaired it and the complaint goes away. That cost only Rs. 75. hahaha. But also add Rs. 600 for tuning charges plus 16% Gov. tax. Anyway, thanks all for your suggestions in this regard.