I had no jetting issues with my single Mikuni either.Not to wander off topic too far, but speaking of exhaust sounds - I just saw a beautiful restored Norton 850 from I think 1970 with the twin peashooters on it. The owner had swapped the two Amals for a single Mikuni, and he said he had no jetting issues with the setup (talk about luck!) In any case, when he kick started it, it sounded absolutely sweet! Lots of low rumble at idle, and when he took off it really growled, but in a really dark and sultry way. Now I think I have a better idea of what Beemie is describing - a really unique and robust sound that is definitely more old school and earthy than my Legend with its TORs. He also said he owned a 98 TBS and 4 more Nortons in his basement which were in various stages of restoration. Man, it was a beauty, and the forward leaning cylinder heads made it look fast just sitting still! Black tank with gold paint, and stainless fenders - very sweet to look at!
Part of the souns you are hearing with vintage engine is due to valve overlap. They weren't as concerned with emissions back then.