How do you tune-up mercury outboard motor 2.2 hp?

first off clean the fuel tank, replace the fuel filter, take the carb apart and clean it and then blow it our with compressed air, replace the spark plug, change the oil in the bottom end, grease moving parts. The alternative to cleaning the carb is to use seafoam or carb cleaner to clean the carb as it's running. You can also decarbon the motor by running a concentration of gas, oil and seafoam into the carb