1977 Evinrude 70hp Starting Issue

[ceostrongatl]

The motor starts up first try. No problem there.
It will run for a few minutes, then stall out. After which time, the motor will crank but not start.
All fuel lines have been replaced, from the tank to the carbs. Everything is tight. No leaks.
Carbs have been cleaned and parts replaced.

Can someone offer any suggestions?

 

[racerone]

Post the compression test values.-----Have battery load tested.

 

[fdrgator]

Check for water getting into the cylinders.