Are these Carbs OE equipment on a new Lycoming/Robinson then?
If no other manufacturer comes forward then its not just the R22 line that will need modification?
The R44 Raven I continues in series manufacture and is a very successful helicopter - that too would surely need a change?
FI has got to be the way forward, get rid of the carb heat lever and eventually we might even get to the level of single lever and Lambda fuel/air mixture control!