Pull carb, and check float, needle and seat

Go to CDI electronics.com for troubleshooting

Make sure you bring some elbow grease

double post

Automobiles have a closed fuel system,it's pressurized, Moisture can't get in. Boats do not have this luxury

Try placing garden hose directly to water tube,pull thermostat housing off,start engine, water should gush out of housing if everything is intact

The old fashioned cylinder drop test

Do a compression test before anything else

Well done

check all fuses on engine and under dash

auto parts store has that oil

this solenoid bypasses the carbs. by directing fuel straight to intake ports for cold starting, It will have no effect on wide open throttle. Are throttle plates opening up all the way,horizontal...

Try pumping the primer bulb while she's running,this would compensate for a fuel restriction or weak fuel pump

Port side of engine, need to buy a shop manual, when you push in key a clicking should be heard on that solenoid, Acts like a chocke

74Merc50, Is your anti-Ventilation plate level with lowest point of the bottom of hull?

Happy boating!!!

Buy a shop manual

pull a bowl off one of the carbs. see if fuel is there

run a compression test before buying

If you are running ethanol fuel you need to drain fuel bowls if engine is going to sit that long