Hello found out that it was in fact one of the choke cables had been pulled out at the 'T' piece so it was acting as though 1 choke was on and the other was off giving the pain in the bum of the dodgy firing. This is all because of the new position on the extended handlebars.
My Dad also balanced up the carbs whilst he was there so now should run better as well whoo hoo!!
So any ideas as to where i can buy longer ones? if not i will have to make one.
Cheers Peeps