Tha a34 doesn't show on anything I've got including "Parts Express". Might be a superceded number of some sort Might be a 9amp where tha 35 is a 16amp. I donno? Maybe someone else can come up with tha answer........
Here is CDI interchange, it shows the 34 &35 both to be 16 amp.
CDI Part #: 174-5456-16
Replaces Part #s: 18-5860, 18-5871, 398-5454A11, 398-5454A15, 398-5454A16, 398-5454A30, 398-5454A31, 398-5454A32, 398-5454A34, 398-5454A35, 398-5454A36, 398-5454A55, 398-5454A61, 398-5454A64
Might be a 9amp where tha 35 is a 16amp. I donno? Maybe someone else can come up with tha answer........