yes, just as if you were going from stock to fmf, from fmf to stock will require rejetting. most likely back to stock jetting since i think v-force reeds usually doesnt require re-jetting.
with the reeds it usually richens the A/F mix because that reed has more surface area, also larger reed petals. moto tassanari says in some cases to drop the main jet 1-3 sizes but not always. good luck