Just a quick glance, but some things are amiss with the carbs. They don't appear to have any sort of air intake filter. (My Falcone 500 doesn't have any either and that is from the factory.)
Also, the carbs seem to have been reversed and installed on the wrong sides. The adjusting screws are facing inward toward the center of the engine and would normally be on the outside on a motorbike. That might just be a maintenance access issue and might not impact performance. The intake manifolds are designed differently and marked for left/right (S/D) usage but I think the carbs work either side.
Patrick Hayes
Fremont CA