Hiya,
Sorry, your right . The woodruff key had sheared and because I had tried the stator in every different position I got desperate and started moving the flywheel around to see if I could find a place where the bike would fire. The replacement coil is from an ossa I think. I have now bought a new woodruff key and spark plug. Tomorrow I am going to clean out the carb as it has been a few years since I tried to start it. I will then have another go at getting the old bugger going! The bike did start a few years ago but only revved backwards. I think it must have bounced on compression after starting forward and ran backwards. Only realised when I went to stall it.