Vespa Lambretta Dellorto PHBH 30 BS Style Carb, CS=36 Made by YSN

DescriptionCarburettor YSN PHBH 30BS2Tconnection engine: 36mmconnection filter: 42/60mmdisc valvemain jet 125idle mixture jet 55jet needle X2drum size: 40, rubber connectionDescriptionThe YSN PHBH 30 carburettor is almost identical to the original in all details. With the manufacturer YSN we have a very good and reliable manufacturer at our side, who continues to produce the legendary carburettors for us. The quality is absolutely comparable with the Italian original and the parts are also 99% interchangeable. Only the gas slides are guided by a slightly longer centring pin in the carburettor. If Dell'Orto gas sliders are to be used, this pin in the aluminium casting can be simply taken back a little bit. A big advantage of the PHB carburettors is their simple and good tunability as well as their insensitivity to weather changes. The PHBH shows quite fast and clearly if the mixture is too rich or too lean. A Mikuni or Keihin carburettor usually runs surprisingly well, even if tuned too lean, which unfortunately can also quickly lead to problems.On most scooter engines, the following basic fuel mixture has proven to be a good starting point for the PHBH series:mixing tube: AV264 needle: X2 or X3 side jet: 55 main jet: 120-145 slide: 30 (rich) or 40 (lean) If problems with the fuel supply are suspected, it is advisable to convert to a larger float needle valve (#250).BS Carburettor = adjusting screws in suction direction leftOEM numbers (for comparison purposes only)DellOrto03302