seeing as how i just did a shee petcock, but to a 34mm carb here's the lowdown................
the banshee petcock takes 5/16" fuel line, and a stock carb takes smaller, you'll prolly have to heat the stock size fuel line a little and try to stretch it with something to fit the bigger shee outlet,
of course do all this heating off the bike and away from the fuel!!! or you'll end up crispy
and jetting has nothing to do with this, if your floats are adjusted to specs it will only allow as much fuel as needed into the carb, the shee petcock will only make sure the supply never runs behind what is needed, and this is generally only needed for bigger carbs, but will work just fine for a stock setup