Abstract: The four stroke engine of motorcycles is mainly worked upon on four basic actions of engine induction, compression, power and exhaust. Initially these stokes has the relationship between TDC [top dead curve] to BDC[bottom dead curve ] and pressure created in assembled engine, there are many types of engine having different types of cc i.e. cubic centimeter such as 100,110,125 up to 1300cc. The combustion in petrol engine is done using flammable mixture of air and petrol which is ignited by time spark when the charged is compressed. Now a day’s many researches are working to increase the fuel efficiency in order to increase the mileage of the vehicle. Our idea proposed is giving a significant results and mileage is observed to be increase dramatically.