When you get to servicing the carbs the Float heights and the Float Needle Valves are critical to correct operation. The service kit I used came with new FNVs and their seat that has an extra small gauze fuel filter in it. I also fitted an inline fuel filter to aid with stopping debris coming into the system,Ok... so I hooked up my bottle to the actual fuel line. Doesn't start.
Hooked up my bottle to the vacuum line, gave it 1-2-3-missisipi to drain a bit. It starts, but dies in 2 secs (like the video above).
Disconnected the output hose from the fuel pump, cranked the engine. The pump is spitting fuel ergo the fuel pump works.
So looking at the vacuum hose, does it go into the cylinder directly? If it does, then I'm bypassing the carb.
The lack of start with the actual fuel line indicates that gas isn't being delivered so the problem is between the fuel pump and cylinder, likely at the carb?