Ammonia is a promising fuel due to its low cost, carbon-free energy carrier, renewable hydrogen carrier, scalability and flexibility, global availability, and long-term energy storage. It can be synthesized from renewable energy sources and used as a carbon-free fuel in internal combustion engines. When ammonia is completely burned, due to the relatively low combustion temperature of the ammonia-air mixture and the absence of carbon in the molecule, the only toxic emissions are nitrogen oxides. These nitrogen oxide emissions can be effectively reduced by the Selective Catalytic Reduction technology, in which ammonia acts as a reductant in the Selective Catalytic Reduction system. This study presents the characteristics of a spark-ignition internal combustion engine 4CH 7.6/7 powered by ammonia fuel. The results show that the maximum brake torque on the wide-open throttle operating characteristics increases by 6.1 %, while the maximum brake power decreases by 30 %, and the brake-specific ammonia fuel consumption is almost 2 times higher than that of gasoline at the same engine power. Moreover, with a research octane number of ammonia up to 110, it will help improve anti-knock properties. Along with that, increasing the compression ratio and using turbochargers can be considered to improve engine performance.