A common misconception is if you put a carb on a smaller engine it needs re-jetting. Not necessarily.

If you let your kid drink out of your pop bottle with a straw do you get him a smaller diameter straw?

The carb will produce a certain A/F ratio at a given airflow. The vacuum source could be a bigger engine or a smaller one, but as long as there is enough vacuum created by the engine so as not to lose adequate signal in the carb re-jetting the main jet system is not necessary.


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