Description: motorcycle carburetors setting manual Very detailed and useful. The jet (32) which adjusts the delivery together with the needle (28); the liquid is. On the left, the power jet (smaller) assembled in the float chamber of a PHBH. 10152 Dellorto PHBH Slide – slotted 10174 Dellorto BN Type atomiser (PHBH). 7790 P Type atomiser (PHBH VHB(T) 27-30mm). Choke support casting. May 20, 2015 - Dell'Orto stopped printing these a while ago but eurocarb ltd. Have commissioned a re-print! We now have the Dell'Orto tuning manual for. Of the Author. The DELLORTO TUNING MANUAL. 2.1 Carburettor diagram and principal parts. Throttle valve (see figure 28) make the pump start to work. Venturi diam.: 26 - 28 - 30mm. Features: - Piston-type throttle valve. Indipendent electric or manual starting circuit - Idling system with jet and air.