Hi,
If the above is true it could be clutch drag causing it to stall, mine does that a bit (MC16), I have to blip the throttle a bit as I kick it into 1st gear when stationary, and you can feel the drag, I think the clutch on mine is on the way out, because if I adjust the clutch so there is no drag when fully in, it slips under power at high revs...
Mat.