Note: A new gasket must be used when installing the carburetor top cover. After installation, a tachometer and exhaust gas analyzer will be required to check the idle speed and air/fuel ratio.
Removal
Disconnect the negative battery terminal.
Disconnect the hoses from the air cleaner, then disconnect the vacuum line and breather hose from the air box.
Unscrew the three screws and remove the air box together with its connections.
Thoroughly remove any dirt from the outside of the carburetor.
Disconnect the fuel supply hose to the carburetor. Since fuel may leak, take appropriate precautions. Insert a plug into the hose to prevent dirt from entering and fuel from leaking.
After marking the location of the automatic choke coolant supply hoses, disconnect them. Coolant may leak, so plug the hoses. Disconnect the choke heating wiring connector.
Disconnect the two vacuum hoses from the choke assembly.
Remove the four carburetor top cover screws, noting their locations, different length screws are used.
Remove the top cover and take out the gasket.
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Using a pin, push the float shaft out from the top cover side and pull out the float and needle valve.
Inspection
Inspect the parts for damage and replace if necessary. Check the needle valve for wear and check for leaks in the float by shaking it to see if there is gasoline in it.
Installation
Remove dirt from the mating surfaces of the carburetor body and top cover.
Installation is carried out in the reverse order of removal, taking into account the following.
After installation, check the needle valve and float and their free movement. The float is not adjustable.
Place a new gasket between the top cover and the carburetor body.
Check that all hoses, tubes and wiring are properly connected.
After installation, check and, if necessary, add refrigerant to the required level as indicated in chapter 3, check and, if necessary, adjust idle speed and mixture quality.
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