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To adjust the choke on a 1978 350 4 barrel Chevy truck engine, turn the screw on the side of the carburetor. This screw is located in the side of the carburetor. Turning the screw to the right makes the choke open farther. Turn to the left to make the choke open less.
If it a Rochester carberator, there is no mixture adjustment. That is an internal setting done when the carburetor was put together or at the time of rebuilding. The only adjustments you can make is to the idle and choke I have a 93' 2500 vandura and It failed smog and I advanced the Timing a tiny bit and it passed....yaaaaay
Clean and adjust the carburetor. Also clean the air filter.
It is a carburetor where the engine coolant is routed through the choke system of the carburetor. When the coolant is cold the choke will close. As the engine coolant heats up it opens the choke.
When using an electric choke you will need to take the manual choke unit out and replace with the e.choke unit. Run power and ground to unit and then adjust to ambient tempature. Then test and tune
you need a pull choke cable to use it manually and then set it so when closed you can fit an 1/8" drill bit between the carb body and the choke flap.
A barrel with a full choke.
For cold starts a choke allows a richer fuel mixture until the engine warms to operating temperature. A Choke is only necessary on motorcycles with a carburetor. Fuel injected bikes adjust their fuel mixture automatically by a local ECU so no manual choke is needed.
There is no choke to adjust.
Manual choke
no
First, you will want to be sure that it isn't flooding. Be sure that the automatic choke is working properly. Set the timing to factory specifications. Then you can only adjust the idle fuel air mixture. If it continues to run rich then the carburetor is most likely the fault.