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hi Norbert, I also bought a set of Denali S4 for my R1200RT, but I'm still waiting for the cansmart controller (see link hereafter) to arrive from the UK (very looooong delivery time - corona ?). It is quite expensive but when you install this controller you'll have no problem installing the S4 ...

note : you can answer in German, no problem, I read, speak and understand German but writing it takes just too much time :-).
I 'discovered' in BMW's DVD 'Repair and Service Data' that ONLY for the R1200GS(K25), R1200RT(K26), R1200ST and R1200S a special notice (is mentioned saying that 'engine ...