hi all thanks for the posts have been in touch with a mate who has a c15 he has removed the carb from his bike so i can try it on my bike if it performs the same going to have to say its the ignition,as for paint or powder coat was hand painted didnt want to spend the money on powder coat to ride off road and get scratched etc never painted the coil bracket so should have a good earth, but do think i will find a way to get a better earth as that idea sounds like a good idea,
cheers chris