Update Time:
I removed the carbs to give them a clean etc, they were pretty dirty and gummed up.
the main jet was butchered but with a bit of patience and some heat and penetrating fluid I managed to get it out and replaced with a new one.
It took a couple of hours but I managed to get them pretty clean in the end, its amazing what you can do with a can of of carb cleaner, a toothbrush and some compressed air!!
Then I set the mixture screws and the the float heights to spec and re mounted them, all good to go.
It was finally time to see if she would fire, so I switched on the ignition and gave her a kick and the thing damn nearly broke my ankle, a second attempt confirmed the first, and after limping back inside the house I did a few searches on here, and came to the conclusion it must have something to do with the advance mechanism.
After ensuring that my ankle was in fact not broken I swapped over the plug leads to see if I possibly had wired the coils backwards but while there was now no kickback there was only some small backfires.
So that's where we are as of now, I'm thinking maybe pull the rotor from the advance mechanism and start again?? must find that timing light..............