Didn't work... Mower does not start...

but no leaks
Tried the following:
A) Fresh Fuel
B) New Spark Plug
C) New Needle configuration both ways, i.e. and sharp and round end in the brass seat.
There is Spark, cos I tested this new plug connected on the lead out of the machine, with the plug grounded. So that rules the electrical out.
Not sure what it could be, the only thing I have not replaced is the float (using the old one).
What could it be... Is the fuel not getting into the firing chamber... ? Any ideas... ?