I think AK managed to do it alright.
Louigi did it using 'bits & pieces' lying around
620 engine (with holes in) + 750ie injectors (same as 620) + loom off of something else + no airbox + cdi from sumfing else again etc etc
It was done with stuff Rich already had in his second-hand parts section, coz neither of us had the cash to do it 'expensively'. I honestly feel there must be something not 100% right in the recipe used, coz it wasn't down on power coz Rich is stupid. His other bikes are tip top kit. It just didn't work out.
I would think if you can find a 620 and all the 620 bits to go with it, it should be alright.
...but you may as well buy a 620 or race the 583.
[Edited on 13-11-2005 by domski]