Originally Posted by gefr
Sorry again. The idle air cutoff is the same with idle air jets
the slow air jets are the same with low jets?
No. The idle air jets ( idle air and idle air cut off), provide air that bleeds and atomizes into the slow fuel jet (or low jet) circuit. The only reason there are two idle air jets is for emissions (imho). The cut off jet cuts off airflow when the throttle is closed, drastically reducing fuel through the circuit when its not needed.
Its best to stick with factory air jets with this filter imho. These tend to function as course adjustments to set the taper and range of the slow jet circuit. Its pretty good where it is...though I will grant there is a good reason to bump idle air slightly when the bigger 45 slow jet is used. More fuel means greater need for air, all things being equal.