Keihin 39 FCR Carbs for Genesis 120

what is the advantage of this carb as opposed to say 38 flats that come on a poo or skidoo? I notice that the slide is slanted, does it help that much with air flow? I thought D slides from keihin were the highest flowing carb with the lightest spring pull(just what i was told) as always, open to new info good or bad
 
The FCR and D are both flat slide carbs, but the FCR is about as state of the art as a carb can be... the next step is EFI. Google the FCR and for some great info.... they are neat carbs.
 


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