Engine HP and measured WHP are not the same thing. Manufacturers do not advertise WHP mainly because it is a smaller number than the BHP (engine power). Also the WHP can be influenced a great deal by the number of things I described in the above post. This way an auto maker can say, this motor makes this much power in all of these vehicles, and you will never ever know if they are actually lying (because drivetrain loss is always estimated, I don't know if there is an actual way you can 100% account for the losses and be completely accurate, but I'm sure some great mathematician out there could do it) unless you take that engine right out of whatever you want to test and put it on an engine dyno, not a chassis dyno.
Also if you're dynoing your bike, make sure the traction control system is disabled and removed, this will effect your whp dramatically as the engine cuts power when it senses that the front wheel is moving slower than the rear wheel.
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