end of my rope, a lot of replacements, no gain

[Wrisberg]

Is there any air leaks between the cylinder head and carb? Try some ether on spray while idling, then you can find out if there is a leak

[Swordsman]

I don't see anything about replacing the hoses, which I thought was usually standard practice. Still sounds like an A/F issue. Maybe a semi-clogged carb too.