What exactly do you want to do with it? It basically works like any other Mikuni, but for some reason the idle screw has a major impact on how the bike runs throughout the range. By the time I had to adjust mine, there were only 2 throttle positions, on and off.
If it is off on the top end, change the main, midrange means to adjust the needle, you can take care of most anything else with the idle screw.
During the 3 years that the 50 was in regular service, I only felt the need to adjust the carb 3 times. 2 were due to performance mods and the other when I learned how rich it was from the factory.