Can anyone give me a crash course on tuning PSI Big Air Carbs

Nov 26, 2007
249
6
18
ND
Just bolted a PSI 990 in my CMX chassis, a project that I started 7 years ago but kids and life and such..... anyways got it in there and started up but have no idea what the dials and screws do on those carburetors, was told they are easy to tune with 3 adjustments. Any info would be helpful.
 

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