Controlling the source vibrations in internal combustion engines is a crucial approach to minimizing the vibration levels experienced by the driver. The driver's subjective perception of vibration is primarily dictated by the vehicle's low-frequency response (<100 Hz). In an IC engine used in agricultural tractor applications, the primary sources of vibration include (a) 1st order inertial force, (b) couples generated by rotating and reciprocating components such as the piston assembly, connecting rod, and crankshaft, and (c) in-cylinder combustion. In this study, an order ranking analysis was conducted on a single-cylinder, air-cooled, naturally aspirated tractor engine within the driver’s operating range to identify the dominant contributors to source vibrations. The 1st order inertial force was observed to be the dominant contributor to the engine's vibration levels. Subsequently, an attempt was made to mitigate the unbalanced forces by implementing counterweight-based balancing strategies. A comprehensive analytical formulation was developed to determine the required bob weights and counterweights to achieve 0%, 25%, and 50% reciprocating mass balancing. In doing so, the rotary mass of the crank mechanism was also reduced, effectively decreasing the resultant forces. The developed crankshafts were tested in two phases: (a) motoring and (b) combustion, to assess the contribution of each factor influencing the engine's vibration signature. The 1st order vibration amplitudes were measured on the engine block across its six faces. A peak-vibration reduction of 12-30% was observed across all faces compared to the baseline engine for the 50% reciprocating mass balancing scenario. Among all the test cases, the 50% reciprocating mass balancing scenario emerged as the most promising prospect.