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Two-stroke engines are being utilized in large numbers as small utility, lawn and garden equipment engines. The following two subjects were examined with regards to exhaust emission control. The first subject was to compare the theoretical values of a combustion model simulation with the experimentally measured values of the base line emission of two-stroke volume as follows in detail. Considering high short-circuiting and residual gas characteristics peculiar to two-stroke engines, comparison analysis between measured exhaust emissions and calculated values by a thermodynamic combustion model simulation. Comparison analysis of the trapping efficiency-corrected HC, NOx, CO mass emission rates by the fuel flow and the fuel and air flow method. Analysis of influence to engine power and mass emission rates by the cylinder thermal load change with varing air-fuel ratio of the charge mixture.