ORIGINAL: firstplaceaviator
The YS is a pressure carb. It is designed to work with a pressurized fuel system. Without a pump, it will cut out suddenly at higher throttle settings.
You could try a Perry VP-30 pump and a one way check valve on your muffler pressure tap. That should do the trick.
The pump will feed constant pressure to the carb, while muffler pressure will pressurize the fuel tank and feed the pump.
Or, take the easy way out and buy the correct carb for that engine.
Doug
What is the small kmetal wheel at the bottom of the high end needle valve? Is this the low end. It never stops turning in either direction to indicate closed or wide open. All it seems to do is change the direction of the fuel mist inside the carb??? I talked with the guy who gave me the engine this weekend and he said he had it running. I came home and messed with it and have gotten close but it isn't there yet. Will it absolutely not run good w/o a pump?
I really think it has something to do with that wheel but I can't for the life of me figure out what it does.
Any further help would be greatly appreciated.
Dan