5. FUEL SYSTEM UXV 500 Insert the piston valve into the carburetor body, and check for free movement. If stick is found, replace the part with a new one. Check throttle valve for free movement. If stick is found, replace the part with a new carburetor. Check the float level after checking the float valve, valve seat and float. (A) Set the carburetor so that the float valve end just contacts the float arm lip. Make sure the float valve tip is securely in contact with the valve seat. Measure the float level with the float level gauge. Float level (A): 17 mm (0.67 in) Bend the tongue as necessary to bring the float height (A) to the specified level. 5-13