The measurement should not be taken at the exit of the venturi! This diameter is very often larger than the actual section of the venturi especially in the case of an oval section.
Here is an example: on this carburetor …
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How to correctly measure the diameter of a carburetor?
Author Team MotorKitPosted on Categories Honda Dax, Honda MonkeyLeave a comment on How to correctly measure the diameter of a carburetor?