dunno??
I remember a good few years back somebody told me that you could do it with a car, I had a scrapper at the time and thought id give it a go - it did work but you have to shift at a certain amount of revs as they are falling - hence getting it wrong caused much gear crunching. Cant say I'd want to try it with my bike though_ hold fire till you get a hoard of definitive answers would be my advise
