Mariner 642S / Yamaha 3.5AC, starts but dies

[jenswenzel]

Hi everybody
I am fighting with this old Mariner, exact same as a Yamaha 3.5 AC
It starts on first or second pull, on choke, but dies after 2-3 seconds.
I cleaned the carburettor as best as I could, but no change.
What do I need to check now?
Thanks for your help.
Jens

[bumperfood]

Let me say at the outset; I have never seen one of these motors, however from what you are describing, it definitely seems fuel related. Here is a parts manual if you are interested

http://www.autocd.info/autocd/OM/3.5...4-28198-E5.PDF