Thus I wanted to check my spark plugs after 16000 miles ( all with PROcede V1, PROcede V2, JB2H and new AA Active Processor ) I bought a new set and exchanged them today.

What you need:

Spark plug socket BMW 121220 ( Hazet )
Torque wrench 23 NM
Hex wrench 5 mm
6 spark plugs BMW 12 12 0 034 087



Procedure:

1) Engine should be cold
2) Remove the microfilter
3) Remove the cowling
4) Remove the 4 hex screws of the engine cover
5) Remove the engine cover

Now it looks like this ( you see the front part of the engine, cylinder 1-3 ):



6) Release the tab from the coil:



7) Unplug the coil:



8) Pull out the coil:





9) Remove the spark plug:



10) Install new spark plug ( 23 NM !!! )
11) Re-insert coil and press it down
12) Reconnect the coil to it's plug ( tab is open )
13) Close the tab
14) Press down the coil once again so that it does not stick out further than the others
15) Do this for every spark plug
16) Start the engine and make sure it runs smooth, turn it off again
17) Put on the engine cover
18) Put on the cowling
19) Put on the microfilter

Done.

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Not more than 500 chp for my daily driver. Well, ... .