1969 35 hp johnson initially runs and eventually dies. Will not restart

[STAN CHANEY]

Old 35 hp will run initially without any problem but eventually will just die .

[Boobie]

Check your spark then your fuel.

[Joe Reeves]

Old 35 hp will run initially without any problem but eventually will just die .

You're speaking in generalities... nobody has any idea if the engine runs for 3 seconds or three minutes, whatever... or how the engine dies, spits, sputters takes 30 seconds to stop... or shuts down like you turned the key off, what?? It's best to be specific and take your time to go into a detailed explanation.