FWIW it looked like about 3:1 final drive ratio to me (14:48?). I don't know how that compares to the stock bike ratio, or how tire diameters compare.
You wanna lug an engine like that? I'd think it would protest since it's tuned for high rpm operations. Intake, cam, exhaust, all that. I'd rather stick a torque monster in there in the first place, than try all that re-engineering.
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