Hi Hal,
I wouldn't rule out small particles lodged in the float valve & set causing the problem. If a Whizzer [or many other motors with small carbuetors] sits for a while the fuel evaporates it can and will leave residue behind.
I always add a little Gummout carburetor & fuel injection cleaner to my fuel to keep the passages cleaner in the carburetor.
Have fun,
I wouldn't rule out small particles lodged in the float valve & set causing the problem. If a Whizzer [or many other motors with small carbuetors] sits for a while the fuel evaporates it can and will leave residue behind.
I always add a little Gummout carburetor & fuel injection cleaner to my fuel to keep the passages cleaner in the carburetor.
Have fun,