The TRIUMF cyclotron was originally conceived for several proton beams extracted simultaneously at different energies. Recent operation includes a 500 MeV beam up to 150 μA for meson users, a 500 MeV beam up to 80 μA for rare isotope production, and a 100 MeV beam up to 70 μA for medical isotopes. Extraction of a second primary beam for ISAC has now been given priority. A necessary characteristic for the primary beams for ISAC is intensity stability better than 1% to allow the highest target temperature (and therefore the most efficient yield of rare ions) to be maintained. An operational solution for stabilization of the existing beam has been shown to be applicable to both beams because of the particular angular separation between the two stripping foils in the cyclotron. Stability dependence from the angular foil separation in the cyclotron is illustrated.