ORIGINAL: Pull Up Now!
Thanks for those carb numbers. Now it's a breeze to click and verify springs are there. I did pull up the WT456 and looked at the exploded view. The part number for what I THOUGHT was the return spring (surge diaphragm spring) was one number off from the one you quoted as the spring # in your first reply. Do I have the right spring? It's on the side opposite the diaphragm [that one side vents to ambient, the other side contains the gas one it's way to the tiny venturi orifices]. Sorry, I don't know the proper name for it. Hope that description ID's which side of the carb I'm referring.
you are looking at the demand regulator and not the fuel pump
The demand regulator has a vent to the atmosphere.
If you are looking at the barrel type WY carbs, it is very confusing to seperate pump and regulator functions
The fact remains that the Honda carbs do not have High Speed Needle Valves.
In a model airplane engine, a high speed needle valve is a must have