5. FUEL SYSTEM MXU 500 IRS ASSEMBLY (17) Carburetor reassembly can be performed in the reverse order of disassembly. When reassembling, carefully observe the (1) following instructions. Assemble the parts taking (2) consideration of their function. (3) Before assembling, wash all of the parts in a clean petroleum based solvent. Replace O-rings and seals with new ones. After cleaning, reinstall the pilot screw to the original setting by turn the screw (4) in until it lightly seats, and then backing it out the same number of turns counted during disassembly. (1) Spring (2) Retainer (5) (3) Jet needle (4) Piston valve (5) Cover (6) Spring (8) (7) Casting enrichment valve (8) Choke air in (9) Main jet (10) Needle jet holder (16) (11) Needle jet (12) Slow jet (13) Float valve (11) (9) (12) (10) (14) Float (13) (15) Float pin (16) Pilot screw (14) (15) (17) Cap (18) Cover (19) Float Chamber (7) (6) (18) (19) 5-17