Per maggior precisione ti allego un post di un forum americano dove sono riportati i numeri di serie delle moto che avevano il problema del gas:
"tell us the last part of your VIN #
that's how we know if the throttle body may be the culprit
IN isolated cases, K 1200 S riders have mentioned the feeling of reduced engine braking when closing the throttle. The feeling is a result of a drag on the throttle valve shaft caused by a partial vacuum in the intake track.
VIN ZM 26399 onward are fitted with the throttle body systems that have benn tested and do not cause tihs vacuum.
VIN including ZM 25013 to and including ZM 26398 are affected.
The test is done using the GT-1 Diagnostic Tester and going through some Diagnosis and checking fault cose memories. If the GT-1 calls for replacing the throttle bodies BMW will make a record order parts and replace under warranty.
check your's out
that might be your answer "