2011 F1 car including driver no less than 640Kg with 2400cc V8 developing say 900bhp. 900/640 * 1000 = 1406bhp/t
1985 CR500 200Kg including rider (apprx) with 491cc single cylinder 2-stroke developing say 65bhp (at crank, probably 55 at wheel). 65/200 * 1000 = 325bhp/t
(Not including KERS etc.)
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