Biodiesel is a chemically modified alternative fuel for use in diesel engines, derived from vegetable oils and animal fats. Biodiesel is produced commercially by the transesterification of vegetable oils with alcohol. Methanol or ethanol is the commonly used alcohols for this process. These can also be produced from the biomass sources. The direct use of alcohols as fuel causes corrosion of various parts in the engine. The transesterification process solves this problem. The processed bio-diesel can be used in diesel engines without any major modification in present design of diesel engine. Experimental investigation is designed to carry out on single cylinder diesel engine to examine the properties like performance and emission parameters with different blends of Kusum oil methyl ester with diesel. The kusum oil blends used in the present work are B10, B20, B30 and B40. Among all these blends the optimum blend obtained is B10. To improve the process of ignition air pre heating is done for the optimum blend B10 in the experimentation. After analyzing the results the conclusions are drawn in the light of current literature and the optimum blend ratios which can give the best performance for the given engine at the selected operating design parameters are suggested.