An experiment work has been carried out to evaluate the parameters affecting a one cylinder engine (spark ignition engine) at two throttle positions (1/2 throttle and full throttle) for two stroke engine and at three throttle positions (1/2 throttle, 2/3 throttle and full throttle) for four stroke engine. Parameters such as brake power, BMEP, Brake thermal efficiency and specific fuel consumption where considered at varying speeds (780, 1560, 2340, 3120 and 3900rpm) and (1000, 1200, 1400, 1600 and 1800rpm) for two stroke and four stroke respectively. The results obtained showed that the brake power, brake mean effective pressure and brake thermal efficiency increases while the torque, specific fuel consumption and volumetric efficiency decreases as the engine speed increases when considering the three throttle positions. The volumetric efficiency and brake power of the two stroke engine for the half throttle positions at 4680rpm for two stroke were 0.229 and 7.545kw respectively compared to the full throttle positions which were 0.299 and 7.662kw respectively. The volumetric efficiency and brake power of the four stroke engine for the half throttle positions at 1800rpm for two stroke were 0.180 and 5.598kw respectively compared to the 2/3 and full throttle positions which were 0.1803, 8.2073kw and 0.1803, 9.2026kw respectively.