depends what you get but summat like an hayabusa etc has 170ish bhp, reverse is easily done via a bike starter motor running a sprocket mounted on the diff drive flange.......you won't regret it either as the rush is awesome not too mention the noise

I used the humble Triumph daytona motor and i could pull away in 2nd no dramas, could be driven sensible but when "hooligan mode" kicks in oh deary me what a giggle