Hi Ianmcg, yes, the poppet valve on your model is the black one with no markings(a,b,c) so any way will do.
Youve changed the primer face and used the same float and needle as i understand it, so my guess is the problem lies therein. Different primer faces have different needles and sometimes the float arms stretch so one float will respond differently to another. My suggestion would be to play around with the needles, or to keep it simple, use the same float and needle combo that the primer face you are using came with, but use your original jet and tube.
If this fails let us know, there are still some other things to check with needles and floats but we'll get into them later if need be.
