Mark
Did you try richening up the needles a bit? Does it run OK at low speeds, and falter at high speeds, or can’t you get it to run at low speeds (start up). If richening up the needles won’t help, you will probably have to pull the carb apart…
Have you confirmed the fuel/oil supply is fresh and free or water? Did you try a different tank/hose? When was the last time the engine ran OK?
Another thought….Is the carb sync OK? Keep in mind that the butterfly is opened slightly when the choke is pulled…The engine won’t run correctly if the linkage is messed up and the butterfly is hanging open when the choke is closed.
