Don't just loosen you have to remove the pinch bolt the kickstart will slide off with a bit of manipulation and maybe some penetrating oil. If you feel the need to add pressure prying it off make sure you use a piece of wood etc against the engine case as the aluminum cases mark and break easily. The spring just comes out with the kick start and is easily replaced.
Get used to the procedure as you will need to become proficient in this as you have to remove the kickstart, engine case and flywheel every time you adjust the points or timing - which can take 10 goes to get it right the first time. I think I had full flywheel removal, timing adjustment and reassembly down to under 15 minutes at one stage.
You had better get yourself a flywheel puller it is absolutely mandatory - commonly available even on eBay