Pump jet - the larger the number the higher the flow rate.
Exhaust valve - the larger the number the less total volume, therefore the shorter the fuel pulse.
35 is the "normal" pump jet for Alfa Nord engines. I doubt that you would notice much difference between 50 and 60 exhaust valves AKA bleed backs.
What is the complete model number of your Webers? The later models typically have smaller progression holes which keeps the mixture pretty lean until you are on the main jets.
Exhaust valve - the larger the number the less total volume, therefore the shorter the fuel pulse.
35 is the "normal" pump jet for Alfa Nord engines. I doubt that you would notice much difference between 50 and 60 exhaust valves AKA bleed backs.
What is the complete model number of your Webers? The later models typically have smaller progression holes which keeps the mixture pretty lean until you are on the main jets.