When I went through the carb I did not see a diaphragm anywhere. There is some rubber on the float needle that controls the flow into the carb bowl. The one I have that is giving me issues is a Keihin carb. It is doing pretty much the same thing but falls on it's face when you twist the trottle, just like fuel starvation. Now that I have typed it out it just occured to me that it may be as simple as the gas hose from the tank to the carb has gone bad. I'll check it tomorrow.

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Jim