Pretty good explanation of carb function

[jsandidge]

This video gives a pretty good explanation of how our carbs work. I thought plug chops should be done under load though.

[Steve]

Nah, ... I explained the way they REALLY work almost three years ago.

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[Grimly]

This video gives a pretty good explanation of how our carbs work. I thought plug chops should be done under load though.

Doing it with no load isn't going to tell much, except that fuel flow is compromised badly enough to show at no load. It's certainly not going to show a partially clogged pathway or jet. Otoh, it will show the right colours if the jetting is in the ballpark, but nothing more than that.
It's a starting point, though.