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@idle
It's easy to tweak the idle speed on SU carbs just follow the throttle cable to the carb and tighten the screw above the cable which would probably stop it stalling (my mini idled lower with the clutch in compared to out of gear so not unusual for it to stall if the idle speed was already low).
Lots of "stage 1" mini's have mixture problems, generally if the inlet and exhaust manifold has been changed as well as swapping the air filter then you will need a new carb needle, they don't come in the kits though so most people just run rich to compensate for the increased airflow, check out http://www.winsu.co.uk/ looks like you have to pay for needle recommendations now but still helpful.