Supermileage vehicle is a response to fuel crisis in modern times. Delhi College of Engineering (DCE) Supermileage has evolved since five generations as an answer to this crisis. A given Briggs and Stratton engine was modified as a part of the making of the vehicle. The stock engine with a configuration of 150cc, 3.5bhp, pull start, carbureted, L head, flat combustion chamber, air cooled was modified to a configuration of 52cc, 1bhp, starter motor enabled, fuel injected, overhead, wedge shaped combustion chamber with oil cooling. This paper gives an overview of the procedure followed during the designing, analysis and manufacturing of the parts of the engine and the difficulties overcome during the same.