Zenith 34 VNN 1-Barrel: Overhaul

1. Remove air cleaner, fuel hoses, choke control and remove rubber boot from throttle spindle plate.
2. Remove nuts retaining carburetor to manifold and remove carburetor. Clean the outside of the carburetor.
3. Remove the four bolts retaining float chamber and remove chamber. Before lowering float chamber, pull it out sideways a bit to free the emulsion orifice.
4. Check the condition of the needle valve and gasket. Examine float lever and spindle. Weigh float to check for damage or leaks.
5. Remove two screws retaining emulsion block and remove block. Remove all jets, choke valve and choke valve spindle.
6. Loosen throttle stop screw and remove choke tube, Check all gaskets for proper condition and blow all passages clean with compressed air.
7. Reassemble carburetor, using new parts where necessary, by reversing procedure. Reinstall carburetor and re-adjust idling speed.

Fig 1: Zenith 34 VNN Carburetor

Courtesy of SAAB-SCANIA OF AMERICA, INC.