couple of tips...

Examine all the fuel lines right back to the clunk in the tank. Verify there are no kinks, pin holes, cracks, or leaks of any sort.

Be certain the needle valve's anti rotation spring is firmly seated so that vibration won't cause the needle valve to rotate.

Take out the pin that prevents the needle valve from turning more than one rotation. (The pin is simply press fit, you can pull it out with pliers and put it back in later if you want.) It's a PITA that gets in the way of learning to tune the engine IMO. Don't be worried about getting the needle valve out of wack. Just start with good and rich, and leave the glow ignitor attached while you lean it out - that will keep the engine running if you happened to get it way to rich.