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The calculator is not really bike friendly because we have a pretty lame drive train with higher than standard (read car) transmission loss.
Yes a brand new chain is good but is only brand new for 1/20 of its life.
Big digression to say that the setup you entered should hit the peak power of the engine at its top speed, namely 8,5 K at 70 mph.
As for its peak power, I don't know.
If it's a 90, 7hp sounds realistic.
If the stall point is not that, then some coefficient need to be tweaked.
Engine efficiency, drive train loss, Cd or S.
I would happily play with the calculator bit I'm on my phone ...
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