Carburetor -YSN PHBL 24 AS- AW=28mm (clamping flange) - without vacuum/oil connection - cable choke

The YSN PHBL 24 carburetor corresponds to the original in almost every detail. With YSN, we have a very good and reliable manufacturer at our side who continues to produce the legendary carburetors for us. The quality is absolutely comparable with the Italian original and the parts are also 99% interchangeable. The only difference is that the throttle slides are guided in the carburetor by a slightly longer centering pin. If Dell'Orto throttle slides are to be used, this pin in the cast aluminum can simply be retracted slightly

. A great advantage of the PHB carburetors is their simple and good tunability as well as their insensitivity to weather changes. The PHBL shows quite quickly and clearly whether the mixture is too rich or too lean. A Mikuni or Keihin carburetor usually runs surprisingly well even when tuned too lean, which can unfortunately also quickly manifest itself in a seizure.

On most scooter engines, the following basic jetting for the PHBL series has proven to be a good starting point

:

• Mixing tube: AQ264
• Needle: D26
• Secondary jet: 60-65
• Main jet: 95-105
• Slider: 40 (lean)

If problems with the fuel supply are suspected, it is advisable to change to a larger float needle valve.

BS carburetor = adjusting screws in suction direction left