If its rich you need to go larger jet on top and smaller bottom jet. Upper is airjet, bigger, the leaner idle&middle range. bottom is fuel jet, bigger and fullthrottle goes richer.
Thats situation with blacktops.

Older uses topjet as fuel jet, larger, the richer idle&middle range BUT ONLY IF ITS BEHIND SCREW, if not then its air jet as above. Bottom does the same as above.

Thing is its rich from the factory so it lasts longer with different users, read as dont seize pistons with too much of a heat because poor cooling.
If you want it to go little crispier you have to lean a little not make it richer and give 2to3deg adv in ignition timing but that nessecary dont make wonders, also have to be carefull with heat on that thing!

These are my thoughts, feel free to correct if needed.




BTW has anyone ran CCMS reeds without stops like Boyesen tell you to do with theirs? IMO spitback is more less with Carson reeds than Boyesens.



.