Charles---Replacing the air filters and the torn diaphragm did increase
the air supply, but should have also increased the fuel flow, as raising
of the air piston should pull fuel with the air. I'd suggest removing
the air filter canister and rev the engine 'by hand', watching to see if
both pistons still rise in unison, and being sure both diaphragms are
installed correctly.
An outside possibility is that there is vacuum being applied to a float
bowl, or a stuck (closed) float needle valve.
Dick
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