i own a 1975 evinrude 70 horse, model number 70573e. the engine will fire right up and run, but only for about 30 minutes then it will die like if someone turned the key off. the motor will then turn but not start back up. tested the plugs and they werent sparking. replaced all three ignition coil, spark plugs and the stator, but the problem continues!! not sure what to test or replace, any help would be appreciated thanks.
