ive had this problem with my mini ,id check all my grounding points with a multimeter and discover that i have no ground to the engine...once.
second time my ignition coil decided its time to go...both times same symptoms.
hallo from Romania!
i just bought an ORK (just like you) and have the same problem...
:).....but i looked on the "www" an found this wiring diagram which is what i was looking for.(and you
)