CX500 Carburetor Intermittent Maintenance Blog :

CX500 Carburetor Maintenance.

The CX500 34mm Vacuum Carburetor System was specifically designed to operation on Leaded Fuel. With Current Exhaust Emissions now in force all Combustion Engines now run on Unleaded Fuel.

Unlike Leaded Fuel, Unleaded Fuel when evaporated leaves an oily residue on all surfaces. When Unleaded Fuel is left the CX500 Carburetor System for a lengthy period of time, the fuel slowly evaporates leaving an oily residue on all surfaces including the Small and Large Jets and also the Piloting Orifices .