Chris you may have to seek advice about alloy welding in your area , but you will have to make sure there are no signs of petrol or fumes in it , before anyone will tackle it .....
Chris just stick with the semi-synthetic two stroke at 50-1 , you don't need the fully synthetic .Just ride and enjoy your
bike and stop trying to MOD it up with the latest this that and the other .....
the magneto fits on with out the woodroof key so the problem i gess is the woodroof key. cant be anything else
Chris you have answered your own question
Chris take your time and don't get excited ,it sounds like your clutch is slipping , you need more adjustment on the nuts .I'm not sure what you mean about the cups ,as one gone inside the clutch ?????