I thought that by now, most folks would know the difference between "claimed" and measured HP figures. A manufacturer would post HP numbers gleaned from tip-top production engines on the bench, for marketing purposes. Yamaha and Kawasaki are famous for this. Those would be dyno numbers measured at the output shaft. A better measurement, and inevitably one that the real world uses, is HP measured at the back wheel, that takes into account inertial losses from the gearbox, chain drive system, wheel etc, that typically accounts for a difference of 10 to 14% over HP measured at the output shaft.
Suzuki has stopped releasing "claimed" HP outputs for some time now, because of the negativity surrounding such figures. That makes sense for production machines that may show a variance in output from unit to unit, and over different markets that have their own peculiar limitations such as available fuel quality, emissions equipment, ground altitudes etc.
I wouldn't worry about those numbers. Dynos are engine tuning tools, that allow a tuner to extract the maximum safe output for a given application. And no two dynos or bikes will ever read the same, so paper comparisons are virtually useless.
