Motorcycle Racing Universal Carburetor Vergaser Dellorto PHBL 20 22 24 25 26 28mm fit for 2/4T Stroke 50-300cc Carb Scooter Engine Model:Carburetor PHBL 20AS Engine: 50-250cc, 2 stroke Application: Motorcycles Venturi diam.: 20mm Model:Carburetor PHBL 22AS Engine: 50-250cc, 2 stroke Application: Motorcycles Venturi diam.: 22mm Model: Carburetor PHBL 24AS Engine: 50-300cc, 4 stroke Application: Motorcycles Venturi diam.: 24 mm 110 Main jet 50 Idle jet Model:Carburetor PHBL 25BS Engine: 50-300cc, 2-stroke Application: Motorcycles Venturi diam. 25mm 92 Main jet 48 Idle jet Model: Carburetor PHBL 26BS Engine: 50-300cc, 2-4 stroke Application: Motorcycles Venturi diam. 26mm 122 Main jet 30 Idle jet Model:Carburetor PHBL 28BS Engine: 125-300cc, 4 stroke Application: Motorcycles Venturi diam.: 28 mm 130 Main jet 50 Idle jet Features: - Piston-type throttle valve Indipendent starting circuit - Idling system with jet and mixture adjusting screw - Main circuit with mechanical mixture adjustment by conical needle - Versions of mixture adjusting screw on the right and/or on the left - Versions with mechanically-operated diaphragm acceleration pump - Sleeve connection with insulating reducing socket from 31.75 to 28.57 and 31 elastic fitting connection - Air intake connection 38 or M38 x 1.25 for trumpet or joint assembly