green plate clone...too rich. help

The carb was done by kevin musgrave, at musgrave race engines. Not sure what has been done. Burn your eyes rich, plug is black, ive tried adjusting the air screw both directions.
Is it rich at idle? They all are (the best running ones) at idle, shouldn't let it idle no more than absolutely long as it does well wide open on the track I am happy.. JMO

alvin l nunley

Site Supporter
Just upgraded my sons engine, and its way rich. Bsp3 cam 38 jet, 3910 plug 33degrees timing. Any suggestions???

Seems it’s too rich, so why haven’t you just put in a smaller jet? Or why not check out the guts of the carb like has been suggested.
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