5. FUEL SYSTEM AGILITY CITY 50 Remove the needle holder and jet needle. Be careful not to damage the vacuum diaphragm. INSPECTION Jet Needle Inspect the needle for stepped wear. Inspect the vacuum piston for wear or damage. Inspect the diaphragm for deterioration and tears. Vacuum Diaphragm ASSEMBLY Install the vacuum piston/diaphragm in the Vacuum Diaphragm Vacuum Chamber Cover carburetor body. Install the spring and then install the vacuum chamber cover. Tighten the two screws. · Be careful not to damage the diaphragm. · Hold the vacuum piston while tightening the vacuum chamber cover. 5-7