12. CARBURETOR VITALITY 50 Main Jet/Needle Jet Holder/Needle Jet FLOAT CHAMBER ASSEMBLY Install the needle jet, needle jet holder and main jet. Install the slow jet. Slow Jet Install the pilot screw. · Be sure to record the rotating turns when it is removed. Pilot Screw Float Screw Float Pin Install the float valve, float and float pin. Install and tighten the screw. Float Valve 12-24