Originally Posted by jaumev
I don't know if Yamaha do this restrictions for emissions or security reasons... the power could be modest but the torque is big. With the switch on the torque is huge and could gives you some problems in wet road or painted zebra crossing.
Thanks a lot for doing that jaumev,
Since the power dip is in the same rev range as the DL1000 "Wheeze zone" I would guess that emissions have something to do with it. Maybe it doesn't have to be as aggressive, and I still don't know whether it is feeding in the throttle gently to eliminate the need for enrichment in that area to get past the drive by tests. (Could be noise OR gas reduction)
Many bikes these days seem to have a funny spot around 4K.