The use of carbon-free fuel like the hydrogen and its derivate, ammonia, is more and more considered for different applications, even for the transportation sector to reduce CO2 emissions. As ammonia is considered as the hydrogen carrier, it can be also considered as a fuel. However, not only ammonia is toxic and corrosive due to its alkaline properties, but also its narrow flammability limits, high auto-ignition temperature and low flame velocity are the challenges to overcome for NH3 fueled in internal combustion engine. The combustion instabilities at low loads and / or high engine speed and unburnt NH3, NOx and N2O emissions minimization are the key points to make NH3 a potential fuel candidate for premixed combustion engines. To guarantee the performances and the stability of the engine, H2 is often considered as a combustion promoter. Water injection is one mean to decrease thermal NOx emissions in current Spark Ignition engine. But only a few studies provide some results to evaluate this potential strategy for ammonia combustion as NOx is also formed by fuel-NOx road. The objective of this study is to experimentally explore the water addition in SI engine at compression ratio of 14. The experimental results addressed the combustion behavior with the exhaust gases emissions (NOX, and NH3) in the case of water addition of using pure NH3 blended or not with hydrogen at 1000 rpm. Kinetics simulations will help for providing some analysis.