Originally Posted by Graemsay
The K1300R weighs about 20 kg / 45 lbs more than the R1200R; the K1300GT is 25 kg / 55 lbs more than the R1200RT; and the K1300S is about 45 kg / 100 lbs heavier than the R1200S. That said, the Ks are generally bigger than Rs.
Very interesting. So it's at least plausible that the engines weigh the same. Outside of character, maybe the COG is the only advantage of the boxer engine?