If you have a grinder and a dremel, you can mod your own shaft and star. If your going to weld a stock crank, first make sure your rod bearings are nice and tight. No sense in welding a crank that is close to worn out. About your stator, are you saying that you just got rid of the plugs and spliced them together? If thats the case, it should work ok, but when you need to take the motor out of the bike, you will have to cut them again. You could get some male and female connectors (good ones), and put them on instead.