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What is the correct fuel pressure I should be measuring at the carb inlets? The service manual specified minimum fuel pump performance at 4000 rpm as 24 liters (per hour, I'm assuming) and 0.3 bar pressure (4.3 psi). What pressure do you measure with a properly working pump under normal conditions?

I intend to replace the mechanical pump with an electric pump and adjustable regulator. I need a pressure to set things up.

Thanks!

Most carb setups work best at 3-5psi. But I'd aim for the 4.3psi as you stated.

Pressure too low and the bowls will not stay full at full throttle; pressure too high and the bowl levels will be too high as fuel can squeeze past the "closed" needle valves.