For Pierre,I doubt the OP needs a timing check yet.Most probably from the early signs a HallSensor going bad.Going then but not well tested? Gone now could be easier testing?An oscilloscope would be nice?Clymer page 290.
I rotated the plate quite a few degrees either way with engine running,from 0 to 10BTDC and never misfired.
Replacing the HallSensor providing the marks were done on the OEM ? Take references between old/new and mount exactly in the same position.
But just in case as I think some of the K100 stuff may be missing here are the marking specs.The 6BTDC mark is the only one needed.
Thanks for the hand drawing and angle calculations - will keep it as a reference - might save me some time one day ;-)
For all others,
Based on "real-time" data log while riding with GS911 plugged, I have seen that most of the time the K1200RS engine will spend time in these range of ignition advance:
1) Idling (warm engine): 10 to 12 degrees
2) 3000 - 3500 RPM: 22 to 27 degrees
3) 3500 - 4000 RPM: 27 to 32 degrees
4) 4000 - 4500 RPM: 32 to 37 degrees
We have to keep in mind that on any EFI control system, these ignition-advance values will also vary based on throttle angle opening AND engine temperature (in addition to RPM).
Thus, we can conclude that give or take 2 degrees of Static setting when installing the Plate (4 instead of 6) , this will not change much "real-life" engine performance. However , setting it at PLUS 2 to 4 degrees might make it "higher risk" IF you fill with cheap low octane fuel - the "brick-engine" K1200 platform does NOT have any knock sensor protection.