Seems that Yamaha's much ballyhooed R6 17,500 rpm redline is actually closer to 16,300 on the dyno - even though it READS 17-5. Bike speedometers have been optimistic since the 1960's and still are - either driven off the front wheel or countershaft pulses. Maybe there's a traditional safety element where you're actually going slower than you think you are OR just marketing (bragging rights to a slightly rigged top speed).
This is the first time I've heard of a company actually fudging the tachometer - mind you in the hotly contested 600 market I'm not really surprised. I think it's a black eye for Yamaha on the trust front and if I owned one I definitely would not like it.
Question for the forum - are our Bandit tachometers spot on according to dyno runs?