kickback

anyone have experience with the kick starter firing back up trying to break your leg on a xr600? and anyone know the causes of this? i have had a fresh engine rebuild and had it running before briefly to pump oil round it and all was ok but starting again after i had some crazy kickback and...

OK, I realise that this applies for any kick-starter bike, but, I like XRs :P So anyway, one of the things that I'm kinda paranoid about when starting a 400 is the kickback, I've heard bad things and would obviously like to avoid them; What is the best way to do this? I've only ever kicked...