If you are stalling at times when, for instance, you get slowed down in second, then turn up a sandy climb and give it some gas, only to have it do something like "thump, thump, clank", just as if you let the clutch out too fast, that's probably just what happened, and you can get rid of it by loosening up the engagement rate (as opposed to the engagement point). With the Rekluse, this is accomplished by reducing the weight in the clutch. Go from 27 balls to 24 on the Z-Start Pro, or use a slightly lighter wedge set (3 lighter 3 heavier, instead of 3 heavies, for instance) on EXP models.
If you are OK when you give it gas at low RPM, but it stalls if you suddenly close the throttle, the trouble is more than likely that your idle is set too rich, which causes the engine to "idle down" so rapidly that it drops below idle RPM momentarily and stalls. A leaner idle makes the engine settle back to idle more slowly.