I'm a beginner with motors so please bear with me. I have a 4-stroke 4hp Mercury outboard (dinghy) motor which was working fine but went unused for 3 years until recently.
It has been intermittently struggling and occasionally cutting out (as if running out of fuel) since relaunching it. I've so far changed the spark plug, changed the oil, opened the carburetor (which seemed clean and fine), checked the fuel pump, replaced the fuel filter and checked all the fuel lines.
It seems to run almost normally with the choke full out, but pushed in it struggles and cuts out after a few seconds.
Looking for ideas on where to look next.