It does not happen much but I know our Nol from Dutch Trash Choppers has done it too. Just cut off the original gearbox of the sporty and replace it with a Fourspeed of a 1340 or 1200 Shovel. Looks cool, gives you an oppertunity to run a primairy belt and it solves the problem of what to do with that Sporty engine with the totally fucked up fourspeed gearbox.