12. CARBURETOR VITALITY 50 FLOAT LEVEL INSPECTION Measure the float level at the location of the main jet (just contacting the float valve). Float Level: 20.51.0mm Replace the float if the level is incorrect. Check the operation of the float and then reinstall the float chamber. Datum plane Datum Plane Vacuum Piston VACUUM CHAMBER ASSEMBLY First install the jet needle and spring into the vacuum chamber and then install the needle holder. Needle Holder Jet Needle Vacuum Piston Spring Install the vacuum piston into the carburetor body. Install the spring. Install the vacuum chamber cover and tighten it with the two screws. · Be careful not to let the diaphragm slip. · If the diaphragm cannot be positioned correctly because of expansion, dry the di h b f i t ll ti 12-25