Is carb actually new, or a rebuild?
They will usually idle well with the two idle adjust screws out about 1 1/2 turns, if everything else is in good nick (ignition timing, plugs, wires, coil, points, condenser, compression).
You should see the idle speed noticeably drop and get rougher as you turn the screws in to 1-turn out and out to 2-turns out if everything else is OK.
The only other external adjustment is the screw on the throttle lever which raises and lowers the idle rpm.
What problem are you having? Just idle or all through the rev range?
You can find the manual for the carb by googling "solex_40nnipcarb.pdf"
Malcolm
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