Shallower bowl designe lends itself, from the end users perspective , easier to access internals, cant speak for the engineers at Keihin's reasons. To high a float level for enduro, not street use has been a common problem with all gasgas carbs past and present and if looking as to the reason for atrocious fuel economy, it's the first place to look. You can adjust the revised float just like you would the earlyier versions by way of a tab. It became apparent right away that the 16 mm settings on the old carb was going to be a no go thats how I realised there was a float bowl redesigne. My float height setting of 8 mm is abritrary, 6-6.5 mm is Keihin spec to the best of my knowledge or you can use parallel seam on float body to carb body flange method. If it in my case it starves for fuel at sustained wot I will go back and adjust accordingly.