This image shows the various things a carburettor goes through from idle to full throttle.
The throttle slide cutouts are in particular important, as they govern the transition to main jet, often the cause of a hiccup.
Some people go the measure of smoothing the cutout.
![](https://b-cozz.com/wp-content/uploads/2022/10/jet2-624x372.jpg)
Tuning tips
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