Carburator for P200E tuned

Hi, I just tunned my old Vespa with a brand new polini 203cc (modified engine)+ Malossi cilider head+Pinaco Exahust. Carb is original and my vespa is not doing well so far... not enough air ( spark lamp comes out black and wet).

 

  So... what will be the best carburetor choice for my little P200...?

 

Thanks in advance!!

Hi ..

what carburetor and what mainjet are you using ?

need more informations [:D]