It depends on what you are mainly concerned with. If fuel economy is an important concern, then very careful needle shimming is usually a must. If not, then there are other formulas that will work pretty well. For best running overall, under the widest range of temperatures, you will want to run a bit richer than you would for maximum power. For that, you can leave the needle alone and compensate with richer jets.
Jets R us should have a Keihin jet in between 95 and 100. Use type 99101-393.
It appears they have knockoff jets at half price too.
www.jetsrus.com/a_jets_by_carburetor_typ...ain_round_28-xxx.htm
You can also use Dynojet mains.
These 3 types of jets all use the convention of the size being hundredths of mm for the orifice diameter, but the jets are constructed differently so the same numbers don't necessarily flow the same, though I found they were not extremely different.
You may have already seen this page on Tk22 jets.
s3.amazonaws.com/gpzweb/TK22mainPage/TK2...22jetsAndDrills.html