there is no such kit for a speedfight, they have swapped it for a runner 125 engine, 2 stroke, this is possible! whats more is that there using the old runner engine as it doesnt have the floating gearbox shaft as on the later ones, THESE ARE PROJECT bikes, you would have to have deep pockets to do this, awesome stuff though, i rebuild these engines with full circle cranks barrells etc, and they are scarily fast!
m
March 2010