u/Available-Series-939

I have a 50 HP 2 stroke MERCURY Outboard that has been sitting for quite some time. I’m trying to get it going again and I can’t quite figure out the issue as I’m new to boating. When I turn the key on the first start of the day it will fire briefly for about a second and then die. Anytime after that the motor will just crank and crank without attempting to fire. Then the next day it will do the same thing. I’ve replaced the battery, fuel lines fuel filter, took out all the carbs and cleaned them, new spark plugs, new solenoid and starter. I do have my safety lanyard in and tested the switch wiring to make sure it’s working properly. If anybody has any sort of suggestion I would appreciate the input.