Hmm 47 is
quite a lot, I'm guessing they had some kind of post calculation going to compensate for the losses in the drive train.
The official power numbers are always on the outgoing shaft instead of the rear wheel, it's usually estimated at about 10% loss so 47 shaft would mean about 42 rear wheel.
Ofcourse, some of the guys running the tests tweak this a bit so they can give the customer nicer figures...
For comparison: My knackered old beast got a first reading of 36 at the wheel, with all the conversion bits off.
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